Constructed from tempered, high carbon tool steel, the Oval Disc Cutter Set includes 7 punches: 4 x 6, 5 x 8, 7 x 10, 8 x 12, 9 x 14, 10.5 x 16, and 12 x 18 mm. For use with soft metals 22 gauge (0.64 mm) and thinner. Block dimensions are 3" square by 1 1/4" high (without the cutters). The Oval Cutter Set works best when positioned over a rubber bench block (see related products below).