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If you need to make a hole in a metal sheet the Greenlee 35178 Knockout Punch is the tool for you. It will allow you to create holes that are precise and smooth. The punch has centering marks on it so that your hole alignment is always accurate. This knockout punch is designed for punching holes in mild steel aluminum fiberglass or plastic. It has a 1diameter and works with all manual hydraulic and battery operated knockout drivers. It can also split slugs for easier slug removal. The Greenlee Knockout Punch will provide you with precision and durability as well as saving time on projects.