Reed offers the most common size of stud punch for metal studs found in 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. ST P710 features two cutting edges. For punches made with the STP710 and other 1 11/32” holes, use GR 1.3 plastic grommets to protect pipe and wire from the metal edges.