Irwin Unibit

Irwin Unibit-20 cobalt step drill covering 9/16 inch through 1 inch in 8 step sizes. Cobalt construction extends bit life on stainless and hardened steel vs standard HSS step drills. Used by...

Irwin Unibit-1 HSS step drill covering 1/8 inch through 1/2 inch in 13 step sizes with self-starting tip. Self-starting tip eliminates pilot drilling on sheet metal and thin-wall material. Used by...

Irwin Unibit-2 HSS step drill covering 3/16 inch through 1/2 inch in 6 step sizes with self-starting tip. Self-starting tip eliminates pilot drilling on sheet metal and thin-wall material. Used by...

Irwin Unibit-3 HSS step drill covering 1/4 inch through 3/4 inch in 9 step sizes with self-starting tip. Self-starting tip eliminates pilot drilling on sheet metal and thin-wall material. Used by...

Irwin Unibit-4 HSS step drill covering 3/16 inch through 7/8 inch in 12 step sizes with 1/16 inch steps and self-starting tip. Self-starting tip eliminates pilot drilling on sheet metal and thin-wall...

Irwin Unibit-5 step drill covering 1/4 inch through 1-3/8 inch in stepped sizes. Larger diameter range than Unibit-1 through 4 supports larger hole drilling in sheet metal and thin-wall material...

Irwin 15502 3-piece Unibit titanium-coated step drill set including 1T, 2T, and 3T sizes. Titanium coating extends bit life over uncoated HSS step drills. Bundled set covers common step drill sizes...