Washer-type break-off plaster ear for best flush alignment. Captive mounting screws. Accepts #12 or #14 Stranded or Solid Copper wire(Push-In Solid only). Back and side wiring for easy installation. Large head combination screws for quick wiring. Easy Access Green Hex Head Ground Screw. Easy Access Green Hex Head Ground Screw. Copper Wire Only. Temperature Rating: -40°F to 167°F. UL 94V-2 Flame Rating. UL listed.