Greenlee 35884 Kwik Stepper Step Bit Kit, 3 Piece,Greenlee,35884" /> Cut up through 3/8" mild steel, copper, brass, aluminum, wood, plastic and laminates Hole sizes from 1/8" through 1-1/8" Balanced, double-flute construction requires less pressure, does the work for you Unique split tip design penetrates through steel faster Resists walking or skidding, even on round surfaces