Constructed from tempered, high carbon tool steel, this Oval Disc Cutter Set includes 2 sizes of punches: approx 1" x 1 3/8" (25 x 36 mm) and 1 1/8" x 1 3/4" (30 x 44 mm). The cutting end of each punch is machined to a slight angle to facilitate the shearing action of the punch. Provided with a wood storage box and a urethane pad. The pad dampens rebound, which otherwise can mar the shape being cut out. For use with soft metals 18 gauge (01 mm or .040") and thinner.