The Qwik-Lok Professional Locking Receptacle is a remarkable 125V-15A replacement / retro-fit locking 'Plug-In’ Connector for extension cords. This virtually eliminates unintended disconnections with the all-too-common frustrations, down-time, inefficiencies and money losing situations so well known world-wide. Eliminates bulky tied knots, frayed and dangerous wires. Upgrade old extension cords to make “Super Cords” Built-in cord restraint for all 16-12 ga. 300V cords Internal conductor made of a Beryllium Copper alloy that does not corrode, arc, burn out, or suffer metal fatigue.