Auto-ground clip assures positive ground. WR marking on face as required by UL Standard. Zinc-plated steel mounting screws for greater ease of installation and removal in wet or damp locations. Strap tabs wrap around face to prevent strap from separating from face and back body. Tri-drive brass terminal screws. Internal screwpressure plate back and side wire capability. Two back wire holes for more wiring flexibility. Heavy-duty, brass strap for added strength and ground conductivity. UV-resistant nylon face for longer life under adverse environmental conditions. Two drive screws anchor strap to backbody and face where abrupt removal torque is strongest. Easily accessed break-off, line-contact connecting tab for fast, easy split-circuit wiring. .032 inch thick brass triple-wipe power contacts for lasting retention.