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Compare material, finish, length class, and decimal size equivalents.
Multidiameter High-Speed Steel Step Drill Bits
 |  |
Style A Round Shank 3-Flat Shank | Style B Round Shank 3-Flat Shank |
 |
Standard |
With no fixed diameters, one bit cuts holes of almost any size within a range. Slip a washer (not included) over the bit to set your diameter. The washer acts as stop while drilling, so choose a washer with an inner diameter that matches your desired hole size. Wear and heat resistant, these high-speed steel bits are versatile for use on a range of materials.
Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.
Shank | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Style | Drill Bit Size | Decimal Size Equiv. | Overall Lg. | Max. Drilling Dp. | Type | Size | Drill Bit Point Type | Each | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Black Oxide | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| A | 1/8" to 9/16" | 0.125" to 0.5625" | 2 1/4" | 0.08" | Round/3-Flat | 1/4" | Standard | 8910A11 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| A | 1/4" to 13/16" | 0.25" to 0.8125" | 2 3/4" | 0.08" | Round/3-Flat | 3/8" | Standard | 8910A12 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| A | 5/8" to 1 3/16" | 0.625" to 1.1875" | 3" | 0.08" | Round/3-Flat | 3/8" | Standard | 8910A13 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| A | 1" to 1 5/8" | 1" to 1.625" | 3 1/4" | 0.08" | Round/3-Flat | 3/8" | Standard | 8910A14 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| B | 1 1/2" to 2 1/16" | 1.5" to 2.0625" | 2 3/4" | 0.08" | Round/3-Flat | 3/8" | — | 8910A15 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
