General Tools 1280ST Hollow Steel Punches (Set of 6) This steel punch set includes 3/16", 1/4", 5/16", 3/8", 7/16", and 1/2" hole punches in a convenient plastic roll pouch The punch works on leather, rubber, gasket material, cardboard and softer metals The internal punch features a side clearance hole for easy removal of punched material The punches are heat treated forged steel, ensuring long lasting performance Because of this heat treatment, the cutting edge will stay sharper longer