Hollow steel punches combine the ingenuity of a specialty tool with the accuracy you?ve come to except from General. Designed with a side-clearance hole. These punches allow you to create holes in rapid succession without clogging the cutting surface. The punched material simply slides through the body of the tool for effortless disposal. The hollow steel punches are made from forged steel and will work on leather, gasket material, sheet metal and other relatively soft surfaces.