THE MASTER LOCK S3822 GRIP TIGHT™ PLUS CIRCUIT BREAKER LOCKOUT DEVICE FITS MOLDED CASE CIRCUIT BREAKERS (480/600 V). ITS LIGHTWEIGHT ONE-PIECE DESIGN EASILY AND CONSISTENTLY INSTALLS WITHOUT USE OF TOOLS. THE STAINLESS STEEL THUMBSCREW AND CURVED BLADE PROVIDE A TIGHT GRIP ON THE CIRCUIT BREAKER HANDLE SO DEVICE REMAINS SECURE. THE FIXED CLEAT PROVIDES ADDED PHYSICAL BLOCKING TO PREVENT SWITCH MOVEMENT INTO ""ON"" POSITION. COMPATIBLE WITH A WIDE VARIETY OF CIRCUIT BREAKER HANDLE SHAPES AND SIZES.