Irwin 10220CB Unibit Cobalt Alloy Steel #20 8 Step Drill Bit 9/16-in. – 1-in.

Quick Overview Step Drill Bit, Material Cobalt Alloy Steel, Steam Oxide Finish, Number of Hole Sizes 8, Shank Size 7/16 In., Step Thickness 1/8 In., Size Range 9/16 In. to 1 In., Sizes Included 9/16 In., 5/8 In., 11/16 In., 3/4 In., 13/16 In., 7/8 In., 15/16 In., 1 In.,