The Master Lock No. 488 Rotating Electrical Plug Lockout Device accepts cords with up to 3/4in (19mm) diameter and an electrical plug up to 3in (76mm) diameter x 6in (152mm). Device surrounds the electrical plug and protect against accidental reconnection. The unique, patented 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. For 240 and 550 volt plugs.