Deluxe Staple Style Slot Punch with Guide Popular staple style slot punch with adjustable guide. Slot size: 1/8' x 9/16" inch or 3 mm x 14 mm. A slot punch provides slot in a PVC card so that it can be worn by using a badge clip or other holder. The punch provides a consistent hole in plastic cards and does not crack the card in two. Some punches that are designed to punch through paper may crack the plastic rather than punch it.