Reed offers the most common sizes of stud punches for metal studs, plumbing, and electrical work. Give fast punches for running wires or lines through metal studs without pre-drilling. Punches 20 gauge steel and thinner steel. STP710 features two cutting edges while STP709 stud punch has four cutting edges. For punches made with the STP710 and other 1 11/32” holes, use GR1.3 plastic grommets to protect pipe and wire from the metal edges. The Reed KO1.3 Knock Out punch has longer life than hole saws.