Cooper electrical connector, heavy duty, grounded, straight blade, 2 poles, 3 wires, 20 a, 125 V, NEMA 5-20r, thermoplastic vinyl, yellow, CSA certified, Nom certified, UL listed, 1/4 - 0.66 in cord diameter, for commercial applications. The Eaton 4228 20-Amp 125-Volt 5-20 commercial grade vinyl connector feature solid brass plug blades are firmly embedded in body. Terminal screw clamps are designed to contain wire and prevent binding. Terminal screws backed out - ready for wiring. Terminals in individual chambers to positively insulate conductors. Vinyl angle plugs have eight possible positions for maximum convenience. Combination slot/Phillips head mounting and terminal screws ease installation with power screwdrivers (slot/Robertson screws in Canada where available).