High-impact resistant thermoplastic rocker, top and backbody. Injection molded housings and PVC resin, comply with UL94 V0 flammability ratings. Tri-combo screw heads, built-in wire stripper. Backwire clamps on side terminals for installation of #12 and #14 wire. Terminal screws are backed out for easier and faster wiring. Thick (0.045 in /1.14mm) steel mounting strap is zinc-plated. Automatic grounding system eliminates the need for bonding jumper in grounded metal enclosure and provides redundant measure of ground continuity where a jumper is used. 120/277 volt AC, 15 amp rocker switches with break-off provision for wiring both devices on the same circuit or on separate circuits. UL, cUL Listed and NOM 426 rated.