The product in display is Round Disc Cutter comes with 5 hardened carbon steel punches ranging from 12.7 - 25.4 mm in width and a square steel disc cutting block. The punches are machined flat and smooth at the cutting end to create perfect circle-shaped blanks every time, and beveled at the other end for use with a heavy mallet or hammer. This round disc cutter will cut up to 20 gauge metal, and can be used on a rubber mat or block to ease the cutting process. To use it, remove all punches from the block, and select the size punch you would like. Place your sheet metal in the slot and place your punch, sharp side against the metal, in the correct slot. Strike the beveled side of the punch with a heavy mallet until it pierces through the sheet metal. Be careful of your fingers and other items on your work surface. Overall length/dimensions: Measures Disc cutter 3 x 2-3/4 inch - Punch sizes: 1/2, 5/8, 3/4, 7/8, 1 inch (12.7, 15.9, 19, 22.2, 25.3 mm) PLEASE CLEAN AND APPLY OIL BEFORE USE. Scorpion is committed to providing the customer with the best source for value possible on the market. You will enjoy the quality, function and usefulness of our products.