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Best Long Length Drill Bits - Buying Guide

Last Updated: 09/15/2019

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  #1

Bosch CO2148 21/64 In. x 4-5/8 In. Cobalt Drill Bit

Model: CO2148   |    Mpn: CO2148   |    Ean: 0000346333602   |    PartNumber: CO2148   |   Asin: B000AEQQX6

Bosch cobalt drill bits are specially designed for drilling in hard steel. Thick web helix delivers fast material removal combined with increased durability for maximum efficiency and performance. Each bit is manufactured to exacting specifications and features a split point that starts on contact with no walking or skating, eliminating the need for a center punch.

Features

  • Withstands high-temperature applications for extended periods of time (up to 1,100 degreeF)
  • Rigid, thick web design adds stability to bit in tough applications
  • Surface hardened to penetrate tough abrasive materials
  • Available in jobber length, full shank
  • Best used for drilling into light-gauge metal, high-carbon steel, aluminum and ally steel, cast iron, stainless steel and titanium
  • See more on Amazon...

Brand: Bosch   |   Manufacturer: Bosch

Package Dimensions: 0.3 x 2 x 8 inches (0.8 x 5.1 x 20.3 cm)

Amazon Price: $5.89 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $15.38

Warranty: No

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  #2

DEWALT DW1610 3/8-Inch by 12-Inch Extra Long Black Oxide Drill Bit

Model: DW1610   |    Mpn: DW1610   |    Ean: 0288741161086   |    PartNumber: DW1610   |   Asin: B00004RGYQ

Black oxide coated for greater wear resistance; split point drills on contact and prevents walking. Parabolic flute design improves chip Ejection in metal and wood drilling applications. Helix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute.

Features

  • The product is 3/8x12 has STL drill bit
  • Easy to use
  • The product is manufactured in China
  • 135 degree split point drills on contact and prevents walking
  • Parabolic flute design improves chip ejection in metal and wood drilling applications
  • Black oxide coated for greater wear resistance
  • Helix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute
  • See more on Amazon...

Brand: DEWALT   |   Manufacturer: Dewalt

Item Dimensions: 0.4 x 1.9 x 14.7 inches (1.0 x 4.8 x 37.3 cm)   |   Package Dimensions: 0.51 x 1.73 x 14.76 inches (1.3 x 4.4 x 37.5 cm)

Amazon Price: Too low to display | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $18.64

Warranty: 1 Year Full Warranty

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  #3

Grizzly G9750 Aircraft Extension Drill Length 13-Piece Set, 1/16-Inch, 1/4-Inch by 6-Inch Long

Model: G9750   |    Mpn: G9750   |    Ean: 0690550097508   |    PartNumber: G9750   |   Asin: B0000DD0PS

These longer length high speed steel drill bits can reach into areas that are difficult to access with standard length drill bits. Model G9750 includes 1/16" - 1/4" by 64ths X 6" long. Model G9751 includes 1/16" - 1/2" by 64ths X 12" long. Model G9752 includes 1 - 60 wire gauge sizes X 6" long.

Features

  • High Speed Steel (HSS)
  • Package dimensions: 4.35 x 7.6 x 1
  • Approximate weight: 1.15 lbs
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Brand: Grizzly   |   Manufacturer: Grizzly

Item Dimensions: 1 x 7.6 x 4.35 inches (2.5 x 19.3 x 11.0 cm)   |   Package Dimensions: 0.9 x 3.7 x 4.8 inches (2.3 x 9.4 x 12.2 cm)

Amazon Price: $15.95 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $15.95

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  #4

DEWALT DW1606 1/4-Inch by 12-Inch Extra Long Black Oxide Drill Bit

Model: DW1606   |    Mpn: DW1606   |    Ean: 5899405899532   |    PartNumber: DW1606   |   Asin: B00004RGYN

DEWALT DW1606 1/4-Inch by 12-Inch Extra Long Black Oxide Drill Bit

Features

  • The product is 1/4x12 has STL drill bit
  • Easy to use
  • The product is manufactured in China
  • 135 degree split point drills on contact and prevents walking
  • Parabolic flute design improves chip ejection in metal and wood drilling applications
  • Black oxide coated for greater wear resistance
  • Helix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute
  • See more on Amazon...

Brand: DEWALT   |   Manufacturer: Dewalt

Item Dimensions: 0.3 x 1.9 x 14.7 inches (0.8 x 4.8 x 37.3 cm)   |   Package Dimensions: 0.24 x 1.85 x 14.72 inches (0.6 x 4.7 x 37.4 cm)

Amazon Price: $10.12 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $10.32

Warranty: 1 Year Full Warranty

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  #5

DEWALT DW1602-1/8-Inch by 12-Inch Extra Long Black Oxide Drill Bit

Model: DW1602   |    Mpn: DW1602   |    Ean: 7257259951789   |    PartNumber: DW1602   |   Asin: B00004RGYL

Black oxide coated for greater wear resistance; split point drills on contact and prevents walking. Parabolic flute design improves chip ejection in metal and wood drilling applications. Helix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute.

Features

  • The product is 1/8x12 HS STL Drill Bit
  • Easy to use
  • The product is manufactured in China
  • 135 degree split point drills on contact and prevents walking
  • Parabolic flute design improves chip ejection in metal and wood drilling applications
  • Black oxide coated for greater wear resistance
  • Helix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute
  • See more on Amazon...

Brand: DEWALT   |   Manufacturer: Dewalt

Item Dimensions: 0.18 x 1.87 x 14.72 inches (0.5 x 4.7 x 37.4 cm)   |   Package Dimensions: 0.12 x 1.85 x 14.65 inches (0.3 x 4.7 x 37.2 cm)

Amazon Price: $4.55 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $14.30

Warranty: 1 Year Full Warranty

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  #6

Qualtech #53 x 6 HSS Aircraft Extension Drill Bit, DWDA/CX653

 Ean: 0887861042833   |    PartNumber: DWTP9/16-18   |   Asin: B00B1CAXIU

#53 x 6" HSS Aircraft Extension Drill Bit, Qualtech, DWDA/CX653

Features

  • HSS Surface Treated Aircraft Extension Drill Bit
  • Size: 53
  • Dec. Equivalent .0595
  • Flute Length 7/8
  • Overall Length 6 Inches
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Brand: Qualtech   |   Manufacturer: Qualtech

Amazon Price: $15.83 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 2-3 business days
List Price: $15.83

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  #7

uxcell Metal Marble Drilling High Speed Steel 11mm Dia.Spiral Drill Bit Black

Model: a13031300ux0390   |    Mpn: Amico   |    Ean: 0700955033244   |    PartNumber: Amico   |   Asin: B00CFNJPII

HSS twist drill bit with straight shank, sharp spiral groove. Used widely to drill the metal and marble, is easy to install. The twist drill bit is used with electrical drilling machine.(here is not included).

Features

  • Product Name : Twist Drill Bit;Features : Straight Shank;Material : HSS
  • Color : Black;Bit Diameter : 11mm/ 0.43;Shank Diameter : 11mm/ 0.43
  • Flute Length : 93mm/ 3.7;Total Length : Total Length
  • 143mm/ 5.6 : 143mm/ 5.6;Net Weight : 74g
  • Package Content : Package Content;1 x Twist Drill Bit : 1 x Twist Drill Bit
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Brand: uxcell   |   Manufacturer: uxcell

Package Dimensions: 0.55 x 6.22 x 6.93 inches (1.4 x 15.8 x 17.6 cm)

Amazon Price: $7.61 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $8.15

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  #8

Drill America 1/16" x 12" High Speed Steel Aircraft Extension Drill Bit, DWDA/C Series

Model: DWDA/CX121/16   |    Mpn: DWDA/CX121/16   |    Ean: 0887861044349   |    PartNumber: DWDA/CX121/16   |   Asin: B00B2QWMUM

Drill America DWDA/C Series High-Speed Steel drill bit is manufactured to National Aerospace Standard 907. 135 split point is self-centering and reduces thrust. Ideal for drilling in mild steels where extra length for reach is required. They have a black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow.

Features

  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
  • Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge
  • Round shanks allow use with a wide variety of tool holding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Manufactured to national aerospace standard 907
  • See more on Amazon...

Brand: Drill America   |   Manufacturer: Drill America

Package Dimensions: 0.2 x 0.4 x 12.5 inches (0.5 x 1.0 x 31.8 cm)

First Available: 2017-10-30

Amazon Price: $6.55 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $6.55

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  #9

Drill America 5/64" x 12" High Speed Steel Aircraft Extension Drill Bit, DWDA/C Series

Model: DWDA/CX125/64   |    Mpn: DWDA/CX125/64   |    Ean: 0887861044356   |    PartNumber: DWDA/CX125/64   |   Asin: B00B2QWXEC

Drill America DWDA/C Series High-Speed Steel drill bit is manufactured to National Aerospace Standard 907. 135 split point is self-centering and reduces thrust. Ideal for drilling in mild steels where extra length for reach is required. They have a black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow.

Features

  • High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
  • Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge
  • Round shanks allow use with a wide variety of tool holding systems
  • When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
  • Manufactured to national aerospace standard 907
  • See more on Amazon...

Brand: Drill America   |   Manufacturer: Drill America

Package Dimensions: 0.7 x 0.7 x 11.8 inches (1.8 x 1.8 x 30.0 cm)

First Available: 2017-10-30

Amazon Price: $4.24 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $6.27

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  #10

SE 849PDS Spiral Drill with Spring

Model: 849PDS   |    Mpn: 849PDS   |    Ean: 7257259920464   |    PartNumber: 849PDS   |   Asin: B001HBY8KE

Use this spiral drill for quickly drilling small holes contains a sliding spiral feature that allows for fast bit spinning action.
Features of this product include:
Dimensions: 3- x dia.
Yankee drill action
Sliding spiral
Collet chuck: 1mm
Brass body
PVC storage pouch
Important:
Avoid getting counterfeit items. Genuine SE products come with our SE logo on the packaging.
SE is committed to providing the customer with the best possible source for value. You will enjoy the quality, function and usefulness this Spiral Drill with Spring has to offer.
SE is a registered trademark protected by US Trademark Law.

Features

  • Dimensions: 3-7/8" x 3/8" dia.
  • Collet chuck: 1mm
  • Yankee drill action
  • Body material: brass
  • Comes in a PVC storage pouch
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Brand: SE   |   Manufacturer: Sona Enterprises

Item Dimensions: 3.84 x 0.36 x 0.36 inches (9.8 x 0.9 x 0.9 cm)   |   Package Dimensions: 0.5 x 1 x 5 inches (1.3 x 2.5 x 12.7 cm)

Amazon Price: $5.58 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $5.58

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  #11

DRILLFORCE10-piece 5/16" Round Shank HSS Titanium Coated Twist Drill Bits for Metal ... (5/16)

 PartNumber: 20017-10   |   Asin: B07989LWJW

Specifications:
* Brand new and high quality.
* Material: 4241 High Speed Steel, Titanium Coated.
* Angle Point: 135 Degree.
* Flute Type: Spiral.
* Shank Type: Straight and Round Shank.
* Specification Met: ANSI.
* Indentation Hardness: 60-62 Rockwell.

High Speed Steel:
* High speed steel construction provides ultimate durability, the cutting edge is hardened and honed for sharpness, chatter-free design with staggered cutting teeth ensure the precise countersinking and hole smooth clean.

Twist Design:
* The split point tip and twist design increases cutting speed while easy self centering prevents walking. Say bye to all those chips and particles, with the twist design the drill bit can quickly clears them out, and leaves a clean, smooth hole.

Notice:
* Please keep cool and gentle using, the working life of the twist drill bits can be largely prolonged by proper usage.
* Not For Use On Concrete, Masonry, Stainless Steel.

* Please check the detail information carefully before purchasing.
* Please allow 1-2mm in size measurement chart for variance due to manual measurement.
* Please excuse us from any possible typos and unintentional misinterpretations * Your satisfaction is our utmost concern, please feel free to contact us for any questions and concerns.

Our Services:
* On-time Delivery: Your product will arrive at the scheduled time.
* Our working time: Monday to Friday, 9:00~18:00. For inquires and customer support, please send your email via amazon email system. All emails will be responded to within 24 hours during business days.

Features

  • Titanium Coated: Classic 4241 High Speed Steel construction with Titanium Coating for proven capability and durability.
  • Strength & Hardness: Made with HSS 4241 steel, Rock wall Hardness Level HRC 60-62.
  • Package & Size: 10 Pieces in a plastic bag, Diameter 5/16 inch, Total length 4-1/2 inch, Working length 3-3/16 inch.
  • Professional & DIY Use: For use on metal, wood & plastics, Not For Use On Concrete / Masonry / Stainless Steel. Perfect match for workshop or service vehicles.
  • 135 Tip & Twist Design: Increases cutting speed with self-centering and prevents walking, clears chips and particles faster.
  • See more on Amazon...

Brand: DRILLFORCE   |   Manufacturer: DRILLFORCE

Amazon Price: $15.99 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $15.99

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  #12

Bosch EX1012 7/16 In. x 12 In. Straight Shank Extension

Model: EX1012   |    Mpn: EX1012   |    Ean: 0000346393002   |    PartNumber: EX1012   |   Asin: B00ELC1Y3A

SDS-plus shank eliminates need for separate drill. Solid bit grip maintains stability of bit and extension in the tool. For use with most common rotary hammers in rotation mode.

Features

  • 12 In. straight extension shank
  • Dimensions 7/16 In. x 12 In.
  • Rugged, high-quality materials to withstand tough concrete applications
  • Maintains bit integrity at impact point
  • See more on Amazon...

Brand: Bosch   |   Manufacturer: Bosch

Item Dimensions: 15.75 x 3.75 x 1.03 inches (40.0 x 9.5 x 2.6 cm)   |   Package Dimensions: 0.4 x 3.4 x 15.4 inches (1.0 x 8.6 x 39.1 cm)

Amazon Price: $8.99 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $8.99

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  #13

DEWALT DW1608 5/16-Inch by 12-Inch Extra Long Black Oxide Twist Drill Bit

Model: DW1608   |    Mpn: DW1608   |    Ean: 0288741160850   |    PartNumber: DW1608   |   Asin: B00004RGYO

Black oxide coated for greater wear resistance; split point drills on contact and prevents walking. Parabolic flute design improves chip ejection in metal and wood drilling applications. Helix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute.

Features

  • The product is 5/16x12 HS STL Bit
  • Easy to use
  • The product is manufactured in China
  • 135 degree split point drills on contact and prevents walking
  • Parabolic flute design improves chip ejection in metal and wood drilling applications
  • Black oxide coated for greater wear resistance
  • Helix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute
  • One year warranty, One year service contract, 30 day no-risk trial
  • See more on Amazon...

Brand: DEWALT   |   Manufacturer: Dewalt

Item Dimensions: 2.25 x 4 x 15.13 inches (5.7 x 10.2 x 38.4 cm)   |   Package Dimensions: 0.4 x 1.18 x 12.83 inches (1.0 x 3.0 x 32.6 cm)

Amazon Price: $10.47 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $13.80

Warranty: 1 Year Full Warranty

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  #14

Drill Hog USA 11/16" Drill Bit 11/16" Silver & Deming Bit HI-Molybdenum M7

Model: 1116M7SD   |    Mpn: 1116M7SD   |    Ean: 0799209319784   |    PartNumber: 1116M7SD   |   Asin: B074D42DGC

Drill Hog is proud to release the newest technology in drill bits. These bits are made from Molybdenum which has a melting point of 4753 degrees Fahrenheit! These bits will drill through the toughest steel like truck frames, stainless steel, farm implements, spring steel, grade 8 bolts, and more! Drill Hog includes a lifetime warranty to the original purchaser.

Features

  • 11/16" Diameter 6" Overall Length
  • HI-Molybdenum M7 HSS Steel
  • 135 Degree Split Point Prevents Walking
  • Tri-Flat Shank Cut Down to 1/2
  • Drill Hog USA Lifetime Warranty
  • See more on Amazon...

Brand: Drill Hog   |   Manufacturer: Drill Hog

Package Dimensions: 0.4 x 4 x 9 inches (1.0 x 10.2 x 22.9 cm)

Amazon Price: $19.99 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $19.99

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  #15

Vermont American 13266 1/4" X 12" Extra Length Drill Bit

Model: 13266   |    Mpn: 13266   |    Ean: 0045325132661   |    PartNumber: 13266   |   Asin: B00004YWPK

Vermont American 13266 1/4" High Speed Steel Extension Length Drill Bit

Features

  • 12" length for extra-reach and deep drilling applications
  • 135 degree split point reduces walking
  • Precision ground from premium high speed steel
  • Ideal for contractors and serious DIYers
  • Lifetime Replacement Policy
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Brand: Vermont American   |   Manufacturer: Vermont American

Item Dimensions: 0.4 x 1.9 x 15 inches (1.0 x 4.8 x 38.1 cm)   |   Package Dimensions: 0.4 x 1.9 x 15 inches (1.0 x 4.8 x 38.1 cm)

Amazon Price: $8.46 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $9.88

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  #16

Drill America 15/64" x 6" Cobalt Aircraft Extension Drill Bit, GLBCO Series

Model: GLBCOX615/64   |    Mpn: GLBCOX615/64   |    Ean: 0887861045520   |    PartNumber: GLBCOX615/64   |   Asin: B00B2QZJQG

Drill America Cobalt Aircraft Extension Drills are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys. Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools; performance is similar to uncoated tools. Drill America Aircraft Extension Drills are manufactured to National Aerospace Standard 907. The 135 split point is self-centering and reduces thrust. Sizes smaller than 1/16 in. have the 118 standard point. Drill America Aircraft Extension Drills are available in 6 in. and 12 in. overall lengths when extra reach is required.

Features

  • Effective in drilling tough, high tensile strength materials like stainless steel, inconel and titanium
  • 135 split point tip prevents drill from walking
  • Round shanks allow use with a wide variety of tool holding systems
  • Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools; performance is similar to uncoated tools
  • 6 overall length for drilling where extra length for reach is required
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Brand: Drill America   |   Manufacturer: Drill America

Package Dimensions: 0.5 x 0.6 x 5.9 inches (1.3 x 1.5 x 15.0 cm)

First Available: 2017-10-30

Amazon Price: $8.43 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $8.43

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  #17

MAGBIT 911.1316 MAG911 13/16-Inch by 12-Inch Long Boy Drill Bit

Model: 911.1316   |    Mpn: 911.1316   |    Ean: 0722170911060   |    PartNumber: 911.1316   |   Asin: B000RX5VPE

Features

  • High speed steel
  • 118 degree split point
  • 1/2-Inch shank with 3 flats
  • Specially designed flutes for better chip ejection
  • Designed to give the roofing and framing contractor more holes per bit
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Brand: MAGBIT   |   Manufacturer: Magnus Industries Inc.

Package Dimensions: 1.1 x 1.1 x 12 inches (2.8 x 2.8 x 30.5 cm)

Amazon Price: $75.24 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $75.61

Warranty: Return defective products to place of purchase for exchange or credit. Warranty does not apply to damage caused by abuse, misuse or alteration.

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  #18

Dent Fix Equipment Df1480 and Plus Hsco Spot Weld Drill Bit 8.0Mm

 Ean: 0013519023217   |    PartNumber: 1480   |   Asin: B00LHF4Y9A

Irwin 2051100CD IRWIN WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Features

Brand: Dent Fix   |   Manufacturer: Dent Out

Item Dimensions: 6 x 0.5 x 2 inches (15.2 x 1.3 x 5.1 cm)   |   Package Dimensions: 0.39 x 2.01 x 5.91 inches (1.0 x 5.1 x 15.0 cm)

Amazon Price: $17.60 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $22.99

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  #19

Qualtech #58 x 6 HSS Aircraft Extension Drill Bit, DWDA/CX658

 Ean: 0887861042888   |    PartNumber: DWTH1316-448LH   |   Asin: B00B1CAS8U

#58 x 6" HSS Aircraft Extension Drill Bit, Qualtech, DWDA/CX658

Features

  • HSS Surface Treated Aircraft Extension Drill Bit
  • Size: 58
  • Dec. Equivalent .0420
  • Flute Length 11/16
  • Overall Length 6 Inches
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Brand: Qualtech   |   Manufacturer: Qualtech

Amazon Price: $12.98 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 1-2 business days
List Price: $9.54

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  #20

Cleveland 950E High Speed Steel Extra Long Length Drill Bit, Black Oxide, Round Shank, 118 Degree Notched Point, 9/64" Dia. x 8" Lg (Pack of 1)

 Ean: 0697334096580   |    PartNumber: C09658   |   Asin: B00074ZS10

The Cleveland 950E series extra-long length drill bit is made from high-speed steel with a black oxide finish and has a 118-degree notched point for extra-deep drilling applications on ferrous materials. High-speed steel (HSS) provides hardness for wear resistance. The uncoated finish has no additional surface treatment or coating. The web thins at the tip to create a 118-degree notched point, which penetrates material without a pilot hole more easily than a conventional point, and maintains a sharp cutting edge longer than a split point. An extra-long length drill bit reaches farther and drills deeper than a jobber or long length drill bit because it has longer flutes and overall length. The round shank accommodates most drill chucks. The drill bit conforms to American National Standards Institute (ANSI) standards.

Drill bits are cutting tools used to make holes in a range of materials using machines such as handheld portable drills, machining centers, and lathes. Drill bits come in a variety of lengths and types, the most common of which is the twist drill bit. The round, twisted shaft of the twist drill bit typically has two cutting edges and flutes. The helical twist of the flutes brings chips up and away from the cutting edges and allows for coolant to reach the cutting edges. Jobber length twist drill bits, the most common length of twist drill bit, offer a good compromise of length and reach for the widest range of materials and applications. Mechanic's length twist drill bits (also called maintenance length) are a little shorter than jobber length and less prone to deflection when drilling. Short length twist drill bits (also called stub or screw-machine length) are the shortest and stiffest twist drill bits, helping to reduce the chance of deflection or breakage when drilling. Reduced shank twist drill bits (also called Silver and Deming drill bits) have a shank that is smaller in diameter than its shaft, permitting drilling machines with a 1/4", 1/2", or 3/4" drill chuck to create large holes. Long length twist drill bits (also called taper length) are a little longer than jobber length, allowing for deeper holes and longer reach. Extra-long length twist drill bits (also called extension) are longer than long length twist drill bits for greater reach or for drilling deeper holes.

Cleveland manufactures tools for drilling, threading, and milling applications. The company, headquartered in Seneca, SC, meets International Organization for Standardization (ISO) standard 9001.

Features

  • Extra-long length drill bit reaches farther and drills deeper than a jobber or long length drill bit
  • High-speed steel (HSS) provides hardness for wear resistance
  • Black oxide finish reduces wear while promoting chip and coolant flow on ferrous materials
  • Self-centering 118-degree notched point penetrates material more easily than a conventional point without a pilot hole, and maintains a sharp cutting edge
  • Drill bit conforms to ANSI standards
  • Made in the USA
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Brand: Cleveland   |   Manufacturer: Greenfield Industries

Package Dimensions: 0.4 x 0.5 x 7.8 inches (1.0 x 1.3 x 19.8 cm)

Amazon Price: $7.99 | as of 09/15/2019(11:17pm pst)
Availibility: Usually ships in 24 hours
List Price: $8.41

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