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Titanium-coated HSS step drills, 3-piece. SetSelf-tapping step drill bits for precision drilling in sheet metal, alloys and plastics up to 4mm thick.Creates clean and precise holes.Drills in 2mm increments.6.35mm (1/4") quick change shank.Includes the sizes 1/8-1/2 inch, 3/16-1/2 inch and 1/4-3/4 inch.