Irwin 10310 Unibit-10 HSS Self-Starting Step Drill 1/2 In 1 Step

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 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...

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...