1/2" - 1" Disc Cutter Concave Convex Metal Hole Puncher Punch 1/2" to 1" Disc Cutter Concave Convex Produce perfect circles from soft metals up to 12 gauge thickness Use with a hammer or a press Types: Cutter, Concave and Convex Sizes: 1/2", 5/8", 3/4", 7/8" and 1"