Step Drills

UNIBIT® 1/4 - 1-3/8" #5 High Speed Steel Step Drill Bit 10235

The Irwin Unibit® high-speed steel fractional self-starting step drill #5, 1/4" - 1-3/8", is ideal for drilling clean, smooth holes in mild steel, copper, bass, aluminum, plexiglass, wood, and laminate.Crafted of high-speed steel, it has a speedpoint tip...

UNIBIT® 3/16 - 7/8" #4 High Speed Steel Step Drill Bit 10234

Irwin 10234 Unibit® #4 12-step high speed steel 3/8-inch step drill bit, 1/16-inch steps (3/16- to 7/8-inch) save time by eliminating the need to change drills when drilling round holes in thin materials.Each smaller size drill also acts as a pilot for...

UNIBIT® 1/4 - 3/4" #3 High Speed Steel Step Drill Bit 10233

Unibit®, 1/4" to 3/4" step drill, 9 hole sizes from 1/4" to 3/4" in 1/16" increments, maximum material thickness 1/8", 3 flatted shank, shank size 3/8", single fluted cutting edge assures true round holes & allows greater control, carded. Irwin Tools...

UNIBIT® 3/16 - 1/2" High Speed Steel Step Drill Bit 10232

This Irwin Unibit® #2 high-speed steel fractional self-starting step drill bit features a single-flute cutting edge for greater control through each of its 6 steps.The sharp speedpoint tip penetrates fast and helps prevent walking, while the hex shank...

UNIBIT® 1/8 - 1/2" #1 High Speed Steel Step Drill Bit 10231

Irwin 10231 Unibit® #1 13-step 1/4-inch step drill bit, 1/32-inch steps (1/8 - 1/2") save time by eliminating the need to change drills when drilling round holes in thin materials.Each smaller size drill also acts as a pilot for the next size.Patented...

4 Pc. High Speed Steel Step Drill Bit Set 10225

The Irwin Unibit® high-speed steel step drill set features single-flute cutting edges for greater control and more precise drilling.Three-flatted shanks prevent the bits from slipping in the drill while the non-skid self-starting tips eliminate skidding...

UNIBIT® 13/16 - 1-3/8" #21 High Speed Steel Step Drill Bit 10221

Designed with a single-flute cutting edge for great control, the Unibit® #21 13/16" - 1-3/8"Step-drill bit makes true round holes every time.It can power through a variety of surfaces, including: stainless steel, copper, brass, aluminum, plastic, and...

UNIBIT® 9/16 - 1" #20 High Speed Steel Step Drill Bit 10220

Get it all done with one when you choose Unibit® stairstep bits.Single-flute cutting edge provides precise depth control though all size steps.Shanks flat side surface ensures slip-free chuck lock-down.Blunt-tip, hole-enlarging bit may be used on...

1/4 ~ 1-3/8" @ 10 Steps HSS Step Drill Bit TGDB-10235

Triple flat shank / will not spin in drill chuck  Tuff Grade Catalog 

3/16 ~ 7/8" @ 12 Steps HSS Step Drill Bit TGDB-10234

Triple flat shank / will not spin in drill chuck  Tuff Grade Catalog 

1/4 ~ 3/4" @ 9 Steps HSS Step Drill Bit TGDB-10233

Triple flat shank / will not spin in drill chuck  Tuff Grade Catalog 

3/16 ~ 1/2" @ 6 Steps HSS Step Drill Bit TGDB-10232

Triple flat shank / will not spin in drill chuck  Tuff Grade Catalog