12 Piece Hole Punch Set Ideal for making clean accurate holes in gaskets, leather, soft plastic, rubber, vinyl and other soft materials. Drop forged carbon steel high quality punches. Sizes (Inch): 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 3/4. Converted to metric (mm): 3.1750, 3.9688, 4.7625, 5.5563, 6.3500, 7.9375, 9.5250, 11.1125, 12.7000, 14.2875, 15.8750, 19.0500. Knurled body for a secure grip. Precision ground flutes and Cutting edges. Heat treated high carbon steel construction. Brand: Hilka. .