Disc Cutter Doming Dapping Metal Hole Puncher Form Cut Concave Convex 1/4 - 5/8 Inch Sizes: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16" and 5/8" Produce Perfect Circles From Soft Metals Up To 12 Gauge Thickness Use With A Hammer Or A Press Types: Cutter, Concave and Convex Qty: 1 Light Item