Master Lock 488 Rotating Electrical Plug Lockout Device accepts cords with up to 3/4″ (19mm) diameter and an electrical plug up to 3″ (76mm) diameter x 6″ (152mm). The device surrounds the electrical plug to protect against accidental reconnection. Rotating design allows for easier installation in confined space applications. The tough, lightweight Zenex Thermoplastic body withstands chemicals and performs effectively in extreme conditions. Includes high-visibility permanent safety labels in English, French and Spanish. For 240-volt plugs and 550-volt plugs