The tip of this automatic punch is made of hardened high speed steel for high strength and durability. Suitable for punching on steel plate, aluminum, copper, wood plate, plastic and other hole positioning materials. This industrial forged brass center punch gives your drill a starting point and makes it easier for you so it won't slip in tight places. Use an automatic hand-held image punch tool with a spring-loaded mechanism that actually works and leaves a solid mark in wood, metal, steel, aluminum, brass, copper and more. The Brass Center Punch from Forge Industrial is equipped with an adjustable tension screw for perfect adjustment, making it easy to operate with one-handed operation. Just hammer it.