IRWIN® #20 Unibit Hole-Enlarging Stairstep Bit, 8-Step, 1/2in to 1in dia, 1/8 in Depth

Get it all done with one when you choose Unibit® stairstep bits. Single-flute cutting edge provides precise depth control though all size steps. Shank's flat side surface ensures slip-free chuck lock-down. Blunt-tip, hole-enlarging bit may be used on stainless steel, copper, brass, aluminum, plastic, laminates and wood. Material(s): Steel; Drill Bit Range [Min]: 1/2"; Drill Bit Range [Max]: 1".