IG symbol and Isolated Ground markings for easy identification and circuit delineation.Triple wipe brass contacts ensure lasting, positive contact with plug blades. High impact resistant nylon face resists impacts and scrapes. Corrosion resistant plated steel strap. Patented feature, external screw pressure plate back wire clamp on ground terminal for faster, easier installation. Plastic barrier isolates grounding terminal from mounting strap and metal boxes. Side and internal screw pressure plate back wire capability with #14 #10 AWG copper or copperclad, solid or stranded wire. Autoground clip assures positive ground.