Durable MaterialThis hole punch tool is made of high quality bearing steel, ensuring durability and longevity. High PrecisionPunches holes cleanly and accurately, perfect for creating precise holes. EfficientThe meticulous design allows even load during cutting, burr no hole that needs no extra finishing. Easy to UseManual Knockout Punch, easy to use drive design uses several turns of a wrench to apply pressure. Wide ApplicationHole Knockout Die and Punch Set is suitable for cutting sheet steel, copper, aluminum, brass, etc. Specification: Material: Bearing Steel Size Chart: 20mm/0.79inch 22mm/0.87inch 25mm/0.98inch Package Includes: 1 Sheet Metal Punch Hole Punch Note: Please allow slightly errors due to manual measurement and different monitors.