Irwin Industrial Tools 10220CB Unibit 1/16-Inch Hole Enlarging 8-Steps Cobalt Step Drill Bit

Irwin Tools IRWIN 10220CB Unibit 1/16-Inch Hole Enlarging 8-Steps Cobalt Alloy Steel Step Drill Bit

Irwin Tools IRWIN Step Drill Bit, 1/8-Inch to 1/2-Inch Step, 1/4-Inch Shank (10231) Silver|Silver metallic

toolant Four Spiral Flute Cobalt Step Drill Bit(Pro), 1/4"-3/4" Impact Ready Unibit Step Drill Bit, 1/4" Hex Shank Step Bits for Metal, Stainless Steel, Aluminum, Plastic