7 Piece 1/4-5/8" Disc Cutter Set ~ Set includes 1/4, 5/16, 3/8, 7/16, 1/2, 9/16 & 5/8" disc sizes. ~ Slide metal between the plates and, with a mallet or heavy hammer of your choice, hit once for best results. ~ The top and bottom plates are made of durable shock-resistant tool steel through hardened for long-wear..