Master Lock 487 Lockout Tagout Rotating Electrical Plug Lockout, 110 & 220 Volt Plugs, surrounds the electrical plug and protects 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 electrical plug sizes up to 2-1/4 in. (57 mm) in diameter x 3-1/4 in. (82 mm) with cord diameter up to 3/4 in. (19 mm) (Most 110 and many 220-volt plugs)