Step Drill Bit Set and Automatic Center Punch, 5 Piece, 41 SAE Sizes Total, 1/8'' - 1-3/8''

The NEIKO 10169A Step Up Drill Bit and Aluminum Center Punch 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. 1pc of 1/4'' Shank: 6 steps (3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2'') 1pc of 1/4'' Shank: 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'') 1pc of 3/8'' Shank: 10 steps (1/4'', 3/8'', 1/2'', 5/8'', 3/4'', 7/8'', 1'', 1-1/8'', 1-1/4'', 1-3/8'') 1pc of 3/8'' Shank: 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'') 1pc Automatic Spring Loaded Center Punch 1 Blow Mold Carrying Case