The Spear & Jackson Centre Punch is simple and accurate to use, with knurled handle to prevent slipping. Giving precise starting point on steel and other solid materials. It will easily mark work using one hand prior to drilling which will prevent the drill from slipping. The Spear & Jackson Auto Centre Punch 125mm is a hand operated tool for making holes in metal. Made from chrome vanadium steel, it has a knurled handle and can punch holes up to 6mm diameter with a pressure of up to 6kgs. The reverse pressure is 9-10kgs, so you can use this tool on both light and heavy materials.