For punching round holes in leather, plastic, rubber, canvas, cardboard and similar materials; special compound joint design requires less effort than other punch pliers; spring tension, self-opening revolving punch; six tapered, hollow, hardened steel, non-clogging punches; plastic grips for comfort and control. Punch sizes: 5/64 in, 3/32 in, 7/64 in, 1/8 in, 5/32 in and 3/16 in.