Step Drill Bit Set, 5 Pcs, for Metal, 50 SAE Sizes, 1/8'' - 1-3/8'', Two Flute Step Down Bits

The NEIKO 10197A Step Up Drill Bit set is your all in one drill bit set, drill a range of different sizes with a single bit. Looking to expand holes or drill into metal, this drillbit in the shape of a cone has multiple sizes in one. Conical shaped bit that allows you to drill a variety of hole sizes without needing to change between bits. The tip of the drill bit drills the smallest hole and as you step or drill further down the diameter increases as you drill. 1/4'' Shank: 3/16'' to 1/2'', 6 steps (3/16, 1/4, 5/16, 3/8, 7/16, 1/2'') 1/8'' to 1/2'', 13 steps (1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32, 1/2'') 3/8'' Shank: 1/4'' to 3/4'', 9 steps (1/4, 5/16, 3/8, 7/16, 1/2'', 9/16, 5/8, 11/16, 3/4'') 1/4'' to 1-3/8'', 10 steps (1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8'') 3/16'' to 7/8'', 12 steps (3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8'')