This 12 Piece Precision Ground Hollow Punch Set is ideal for making clean, accurate holes in leather, gaskets, plastic, rubber, vinyl, paper/card, and other soft materials. The set includes sizes: 3mm (1/8"), 4mm (5/32"), 5mm (3/16"), 6mm (7/32"), 7mm (1/4"), 8mm (5/16"), 10mm (3/8"), 11mm (7/16"), 12mm (1/2"), 14mm (9/16"), 16mm (5/8"), and 19mm (3/4"). The punches are made from heat-treated high carbon steel with knurled bodies for a secure grip and feature precision ground flutes and cutting edges.