Drill Bit Lengths
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Drill bits have different types and kinds. Some drill bits are used for making starting hole. Some of them are used for soft materials and others are built for hard ones. There are also those used to enlarge holes or for finishing purposes. These types include, center, twist and core drill bits.
The Twist Drill Bits
These are applied to drill holes on various materials such as plastics, woods or metals. These are available in many sizes. The common sizes are from 0.05 mm in length up to 100 mm in length. These sizes are used to describe the diameter of the hole covered by the drill-bits.
For example the drill bits size 0.05 mm covers the two over one thousand millimeter (0.002 mm) diameter of hole and the size 100 mm covers the hole with diameter measures four millimeter (4 mm). These bits also have a size of 1000 millimeter (1000 mm) in length which covers the hole with diameter of 39 millimeter (39 mm). This size is used for powered hand tools.
The point angle of the twist drill-bits is also considered. Different point angle has diverse applications. The one hundred eighteen (118) degree point angle is the most flexible point angle. These can be used in many purposes. However, there are point angle of the twist drill bits made for specialized and specific task.
Those without point angle are for the making holes with flat-bottoms. These are so sensitive in terms of positioning as any slight movement while drilling may cause in undesirable outcome.
The twist drill-bits with ninety (90) degree point angle are used to create holes on very soft plastics. These types are very sharp and could produce starting hole for itself.
The one hundred fifty (150) degree point angle are made for creating holes on hard materials like metals. These require a starting hole which can be obtained by means of center drill bits for easy operation and fine results.
The Center Drill Bits
These are available in sizes one to six. These are commonly used in working with hard materials like metal. The center drill-bits have two (2) main purposes. First is for crafting a starting hole for the twist drill bits with 150 degree point angle, for reamer, for core or for any larger pieces. Meaning, the center drill bits applied for outlining a center hole for making bigger hole or use as preparation for making hole in hard materials. Second is for creating conical indentation to build up a lathe center for a piece of work.
The Core Drill Bits
These are solid. Like reamer bits, these can not create starting hole because they do not have a cutting point. However, core drill bits have three or four flutes. The flutes improve the finish of the hole and ensure fine bit cuts.
The core drill bits have two main functions. It can be used for enlarging the hole or starting hole, and could double the size of the hole unlike the reamer bits. It can also be used for finishing purposes. It is possible to achieve perfect rounded shape holes due to the flutes of the core drill-bits.
For more information on Drill Bits Sets and Drill Bit Sharpeners please visit our website.
And, of course, ebay is a great place to find items:
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12mm 0.47″ Tip Spiral Flute Electric Drill Bit 6.3″ Length $6.78 |
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10mm Wide Tip Straight Shank Drill Bit 145mm Length w Case $6.15 |
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10 Pcs 56mm Length High Speed HSS Steel Bit Drill Bits $10.35 |
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SDS Plus Shank Concrete Hammer Drill Bit 160mm Length $4.55 |
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5 Pcs 4.8″ Length Straight Shank Twist Drill Bit 10mm $17.20 |
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Straight Spiral Flute 12mm Tipped Drill Bit 160mm Length $6.75 |
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12mm 0.47″ Tip Spiral Flute Electric Drill Bit 6.3″ Length $6.40 |
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8mm Tip Rotary Hammer Drill Bit 160mm Length w Case $6.25 |
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2.2mm Dia 53mm Length HSS Metal Twist Drill Bit 5 Pcs $3.40 |
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2.8″ Length 5/32″ Drilling Dia Straight Shank Twist Drill Bit 10 Pcs $16.16 |
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27mm Flute Length 2.4mm Dia Straight Shank Twist Drill Bit 10 Pcs $4.36 |
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230mm Length 20mm Dia Auger Drill Bit for Woodworking $9.90 |
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10 Pcs 52mm Length 2.1mm Diameter Mini Twist Drill Bit $5.59 |
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93mm Length 5.5mm Diameter Twist Drill Bit Tip 5 pcs $4.74 |
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Rotary Hammer 120mm Length Masonry Drill Bit Power Tool $4.64 |
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118mm Length Gray Twist Drill Bit Boring Tool 5 PCS $10.33 |
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Four Hollow Shank 14mm Hammering Drill Bit 150mm Length $5.63 |
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10 x Silver Tone 3.9″ Length Double Ended Cross Screwdriver Drill Bit $14.44 |
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85mm Length Flute Hammer Drill Bit for Concrete Stone $5.12 |
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35mm Length Spiral Flute Stone Masonry Hammer Drill Bit $4.36 |
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6mm 0.24″ Tip Spiral Flute Electric Drill Bit 160mm Length $5.76 |
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10 Pcs 79mm Length Double Ended Phillips Screwdriver Drill Bit Tips $11.67 |
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120mm Length Spiral Flute Hammer Drill Bit for Concrete $6.21 |
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Irwin 4-Pack 1″ Speedbor Standard Length Spade Drill Bit Paddle $9.99 |
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8mm Tip Rotary Hammer Drill Bit 160mm Length w Case $6.28 |
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75mm Length Spiral Flute Masonry Stone Hammer Drill Bit $6.01 |
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Spiral Groove 200mm Length Masonry Drill 10mm Bit Tool $5.81 |
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Spiral Groove 150mm Length Hammer Drill Bit for Masonry $4.84 |
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10mm 0.39″ Tip Spiral Flute Hammer Drill Bit 5.71″ Length $6.15 |
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SDS Plus Shank Stone Hammer Drill Bit 80mm Length Flute $5.59 |
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30mm Length 10mm Diameter Masonry Carbide Drill Bits $7.40 |
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12mm 0.47″ Tip Spiral Flute Electric Drill Bit 6.3″ Length $6.46 |
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10mm 0.39″ Tip Spiral Flute Hammer Drill Bit 5.71″ Length $6.16 |
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Rotary Hammer 120mm Length Masonry Drill Bit Power Tool $4.67 |
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7cm Length Gray HSS 3.7mm Twist Drill Bit Tip 10 Pcs $4.49 |
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12mm Width Tip 85mm Length Flute Stone Hammer Drill Bit $5.12 |
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8mm Flute Length 0.8mm Dia Electrical Twist Drill Bit $4.70 |
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4.8″ Flute Length 16mm Tip Width Hammering Drill Bit 200mmm Length $7.93 |
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10 Pcs 48mm Length High Speed HSS Steel Bit Drill Bits $9.31 |
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10 Pcs 56mm Length High Speed HSS Steel Bit Drill Bits $9.79 |
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85mm Length Flute Hammer Drill Bit for Concrete Stone $5.11 |
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70mm Length Spiral Flute 6.5mm Twist Drill Bits x 5Pcs $5.88 |
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17″ LENGTH 12″ TWIST DRILL BIT IRWIN AMERICAN TOOL COMPANY # 47420 NIP $28.95 |
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Straight Spiral Flute 12mm Tipped Drill Bit 160mm Length $6.45 |
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90mm Flute Length 10.5mm Dia Helix HSS Twist Drill Bit $4.33 |
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10 Pcs 52mm Length 2.1mm Diameter Mini Twist Drill Bit $6.22 |
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6mm Tip Width 41mm Flute Length Hammering Drill Bit $3.67 |
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35cm Length 14mm Shank 18mm Tip Masonry Drill Bits $12.50 |
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Triangle Shank 150mm Length Twist Masonry Drill Bit $4.79 |
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30mm Length 10mm Diameter Masonry Carbide Drill Bits $7.18 |
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10mm Wide Tip Straight Shank Drill Bit 145mm Length w Case $6.20 |
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49mm Length Spiral Groove Hammer Drill Bit for Masonry $5.19 |
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8mm Tip Width 78mm Flute Length Hammering Drill Bit $4.56 |
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Carpenter 230mm Length 18mm Cutting Dia Auger Drill Bit $9.71 |
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93mm Length 5.5mm Diameter Twist Drill Bit Tip 5 pcs $4.71 |
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30mm Length 10mm Diameter Masonry Carbide Drill Bits $7.61 |
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Buy 144 #30 HSS Jobber Length Drill Bits & Get 144 More FREE 118° Point USA Made $69.99 |
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4 new 5 mm metric drill bits Jobber length Chicago Latrobe HSS 188 degree pt $12.00 |
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145mm Length Masonry Hammer Spiral Flute Drill Bit New $5.76 |
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35cm Length 14mm Shank 18mm Tip Masonry Drill Bits $10.28 |
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Wood Cutting 230mm Length 24mm Diameter Auger Drill Bit $12.12 |
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DEWALT DRILL BITS HSS 2 1/8 INCH LENGTH 7/64 INCH 6 COUNT $0.99 |
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MINNESOTA TWIST DRILL BIT WITH COBALT 3 1/2″ LENGTH 1/4″ BIT USA MADE 2 COUNT $0.99 |
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T30 T-30 TORX 6 point Star Bit 1/4″ hex shank 1″ length wholesale 250 drill bits $49.99 |
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35cm Length 14mm Shank 18mm Tip Masonry Drill Bits $10.28 |
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12Pc Pack #15 HSS Jobber Length Drill Bits 118° Pt $10.69 |
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230mm Length 20mm Dia Auger Drill Bit for Woodworking $9.90 |
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KnKut 27/64″ Jobber Length Drill Bit KNKKK5-27/64 $11.59 |
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16mm Diameter 160mm Length Twist Masonry Drill Bit $5.56 |
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Vermont American 3/16″ High Speed Steel Extension Length Drill Bit 13162 $6.99 |
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Vermont American 7/16″ High Speed Steel Extension Length Drill Bit 13278 $12.99 |
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Vermont American 7/32″ High Speed Steel Extension Length Drill Bit 13164 $7.33 |
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160mm Length SDS Plus Shank Hammer Masonry Drill Bit $5.56 |
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30mm Length 10mm Diameter Masonry Carbide Drill Bits $6.56 |
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Hitachi 3/8″ Black Shield 135° Split Point Extended Length Drill Bit $15.00 |
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KnKut 7/16″ Jobber Length Drill Bit KNKKK5-7/16 $10.15 |
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235mm Length Flute Hammer Drill Bit for Concrete Stone $11.45 |
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7cm Length Gray HSS 3.7mm Twist Drill Bit Tip 10 Pcs $4.52 |
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Vermont American 1/4″ High Speed Steel Extension Length Drill Bit 13166 $7.56 |
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5/16″ Fractional Sized 135° Split Point Jobber’s Length High Speed Drill Bit $3.97 |
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10 Pcs 1.6mm Diameter 42mm Length Mini Twist Drill Bit $8.54 |
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12″ Brad Point Drill Bit Set Extra Length 1/8 3/16 1/4 5/16 3/8 7/16 & 1/2 inch $7.49 |
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12″ Brad Point Drill Bit Set & Stop Collars , Extra Long Length in 1/8-1/2 inch $13.49 |
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12″ Brad Point Drill Bit Set , Extra Long Length 1/8 3/16 1/4 5/16 3/8 7/16 1/2 $8.99 |
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SDS Plus Shank Concrete Hammer Drill Bit 160mm Length $4.09 |
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Carpenter 230mm Length 16mm Dia Auger Drill Bit Cutter $8.42 |
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100mm Flute Length 12.5mm Dia Helix HSS Twist Drill Bit $5.02 |
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Vermont American 1/2″ High Speed Steel Extension Length Drill Bit 13282 $14.99 |
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35mm Length Spiral Flute Stone Masonry Hammer Drill Bit $4.17 |
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Precision USA 12pcs Jobber Length #14 Twist Drill Bits $13.99 |
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Precision USA 12pcs Jobber Length #17 Twist Drill Bits $13.99 |
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Precision USA 12pcs Jobber Length #35 Twist Drill Bits $13.99 |
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Precision USA 12pcs Jobber Length #57 Twist Drill Bits $13.99 |
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Qualtech 12pcs Jobber Length Black #28 Twist Drill Bits $13.99 |
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Qualtech 12pcs Jobber Length Black #49 Twist Drill Bits $13.99 |
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Titan USA 12pcs Jobber Length #1 Black Twist Drill Bits $15.99 |
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CHICAGO-LATROBE 46101* DRILL BIT, #31, JOBBER LENGTH, 118 DEGREE POINT 77967 $13.00 |
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CLE-LINE C07876 DRILL BIT, LETTER SIZE K, FLUTE LENGTH 2-15/16″ 91624 $2.00 |
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Masonry 14mm Width Tip 146mm Length Spiral Drill Bit $6.70 |
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CHICAGO-LATROBE 48721* SCREW MACHINE LENGTH DRILL BIT, DRILL SIZE: #21 14106 $2.00 |
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