Disc Cutter - Circle - 5 Punches - SFC Tools - 25-146 Comes with 5 hardened steel punches ranging from 12.7-25.4 mm in width and a square steel disc cutting block. Will cut up to 20 gauge metal. Punch sizes (mm): 12.7, 15.9, 19, 22.2, 25.3 Punch sizes (inches): 1/2, 5/8, 3/4, 7/8, 1