Hard use receptacles specification grade. Impact-resistant nylon face thermoplastic back body. Corrosion-resistant, plated steel strap locked in to face back body to resist pulling away from face/body assembly. 8 hole back wire terminals accept #10-14 AWG solid or stranded copper or copper-clad conductors (5252 series only). Terminal compartments isolated from each other for positive conductor containment. Easily accessible break-off tab on line contact for split circuit wiring. One-piece, triple-wipe brass power contact. Automatic grounding to metallic boxes.