General Tools 1280M Hollow Steel Punch The General Tools and Instruments 1280M Hollow Steel Punch, 1/2" is meant for punching a 1/2 inch hole 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