TEKTON 6588 Hollow Punch Set, 12-Piece Heat treated carbon steel construction Precision ground flute and cutting edge Non-slip knurled handle grip Cuts clean holes in gaskets, leather, rubber, cardboard, and other soft materials Set Includes: 12-pc. Hollow Punches: 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 3/4 in.