Greenlee hydraulic punch driver sets or knockout punch sets are widely used by electricians, auto mechanics and metalworkers to knock out holes in stainless steel, brass, copper, aluminium, fiberglass and plastic surfaces. These punch drivers are ideal for use with stainless steel workpieces with thicknesses up to 10 gauges and are further capable of self-centering / self-aligning itself on the pilot hole. They have a unique punch profile which splits slugs for easier slug removal and provide superior abrasion resistance when punching fiberglass or plastic stocks. Choose from an array of these hydraulic punch driver sets available in mild steel and stainless steel material options on Raptor Supplies.