Features and Benefits: All titanium coated; Self-starting multiple hole sizes; Drill bits can cut accurate holes in sheet metal and plastics up to 3.4mm thick; All drill bits have a 1/4" shank; Includes storage pouch; Titanium Step Drill Bit SetSelf-starting multiple hole sizesDrill bits can cut accurate holes in sheet metal and plastics up to 3.4mm thickAll drill bits have a 1/4 in.; shankIncludes storage pouchSet Includes:13 Hole sizes from 1/8 in.; to 1/2 in.; and 1/32 in.; increments6 Hole sizes from 3/16 in.; to 1/2 in.; and 1/16 in.; increments9 Hole sizes from 1/4 in.; to 3/4 in.; and 1/16 in.; increments