Irwin 10502ZR 3-piece Unibit step drill set including Unibit-1, Unibit-2, and Unibit-3 in HSS construction. Bundled set covers common step drill sizes for electrician, HVAC technician, and metalworker tool kits.
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...
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-10 HSS step drill at 1/2 inch in single step size with self-starting tip. Single step bit produces 1/2 inch holes in sheet metal and thin-wall material. Self-starting tip eliminates...
Irwin Unibit-20 HSS step drill covering 9/16 inch through 1 inch in 8 step sizes. Step drill bores progressively larger holes through sheet metal and thin-wall material in a single bit. Used by...