Decimal Size Equivalent Decimal Size Equivalent |
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For Use On For Use On |
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Bit Style Bit Style |
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 | Spiral Flute |
 | Open Spiral Flute |
Material Material |
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Finish Finish |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Drill Bit Decimal Size Equivalents
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About Drill Bits
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Drill Bits for Wire Installation
Unlike traditional wire-installing drill bits, you do not need to strip the end of the wire when using one of these bits. After drilling, insert the wire into the bit's hollow shaft and pull through the drilled hole. Also known as bell hanger bits.
For technical drawings and 3-D models, click on a part number.
Shank | ||||||||
|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Max. Drilling Dp. | Type | Size | Point Style | For Use On | Each | |
18" Overall Lg. | ||||||||
Inch | ||||||||
Black-Oxide High-Speed Steel | ||||||||
| 21/64" | 0.328" | 3.31" | Round | 5/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 000000 |
| 25/64" | 0.39" | 3.88" | Round | 3/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
| 29/64" | 0.453" | 4.19" | Round | 7/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
| 33/64" | 0.515" | 4.81" | Round | 1/2" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
Black-Oxide Carbide-Tipped Steel | ||||||||
| 21/64" | 0.328" | 4" | Round | 5/16" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
| 7/16" | 0.438" | 4" | Round | 3/8" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
| 9/16" | 0.563" | 4" | Round | 1/2" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
28" Overall Lg. | ||||||||
Inch | ||||||||
Black-Oxide High-Speed Steel | ||||||||
| 21/64" | 0.328" | 3.31" | Round | 5/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
| 25/64" | 0.39" | 3.88" | Round | 3/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
| 29/64" | 0.453" | 4.19" | Round | 7/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
| 33/64" | 0.515" | 4.81" | Round | 1/2" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
Black-Oxide Carbide-Tipped Steel | ||||||||
| 21/64" | 0.328" | 4" | Round | 5/16" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
| 7/16" | 0.438" | 4" | Round | 3/8" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
| 9/16" | 0.563" | 4" | Round | 1/2" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
36" Overall Lg. | ||||||||
Inch | ||||||||
Black-Oxide High-Speed Steel | ||||||||
| 21/64" | 0.328" | 3.31" | Round | 5/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
| 25/64" | 0.39" | 3.88" | Round | 3/8" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
| 29/64" | 0.453" | 4.19" | Round | 7/16" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
| 33/64" | 0.515" | 4.81" | Round | 1/2" | Standard | Steel, Iron, Stainless Steel, Aluminum, Copper, Brass, Bronze, Fiberglass, Plastic, Wood | 0000000 | 00000 |
Black-Oxide Carbide-Tipped Steel | ||||||||
| 21/64" | 0.328" | 4" | Round | 5/16" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
| 7/16" | 0.438" | 4" | Round | 3/8" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
| 9/16" | 0.563" | 4" | Round | 1/2" | Standard | Masonry, Concrete, Wood | 0000000 | 00000 |
Flexible-Shaft Drill Bits for Wire Installation
The shaft is made of spring steel instead of hardened steel, so it flexes while drilling, allowing you to drill inside walls or between floors. A hole in the flute near the tip lets you pull wire through after holes are drilled. The end of the wire must be stripped prior to attaching it to the bit. Also known as bell hanger bits.
Use a hand guide (sold separately) to position flexible-shaft drill bits.
Use a ball guide (sold separately) to keep flexible-shaft drill bits centered between studs and drywall.
Inch Drill Bits
Shank | 54" Overall Lg. | 72" Overall Lg. | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Decimal Size Equivalent | Type | Size | Shaft Dia. | For Use On | Max. Drilling Dp. | Each | Max. Drilling Dp. | Each | ||
Powder-Coated Steel | |||||||||||
| 3/8" | 0.375" | Round | 3/16" | 3/16" | Wood | 53" | 000000 | 000000 | 71" | 000000 | 000000 |
| 1/2" | 0.5" | Round | 1/4" | 3/16" | Wood | 53" | 000000 | 00000 | 71" | 000000 | 00000 |
| 9/16" | 0.5625" | Round | 1/4" | 3/16" | Wood | 53" | 000000 | 00000 | 71" | 000000 | 00000 |
| 5/8" | 0.625" | Round | 1/4" | 3/16" | Wood | 53" | 000000 | 00000 | __ | 000000 | 00 |
| 3/4" | 0.75" | Round | 1/4" | 1/4" | Wood | 53" | 000000 | 00000 | __ | 000000 | 00 |
| 1" | 1" | Round | 1/4" | 1/4" | Wood | 53" | 000000 | 00000 | __ | 000000 | 00 |
Hand Guides
For Drill Bit | |||||
|---|---|---|---|---|---|
| Material | Shank Type | Shaft Size | Lg. | Each | |
| Steel | Round | 3/16", 1/4" | 10" | 000000 | 000000 |
Ball Guides
Ball Guide with Drill Bit
Ball Guides
For Drill Bit | |||||||
|---|---|---|---|---|---|---|---|
| Material | Shank Type | Shank Size | Shaft Size | Dia. | No. of Guides | Each | |
| Plastic | Round | 3/16" | 3/16" | 1 1/2", 2" | 2 | 000000 | 000000 |