THE MASTER LOCK S3821 GRIP TIGHT™ PLUS CIRCUIT BREAKER LOCKOUT DEVICE FITS MINIATURE CIRCUIT BREAKERS (120/240 V). ITS LIGHTWEIGHT ONE-PIECE DESIGN EASILY AND CONSISTENTLY INSTALLS WITHOUT USE OF TOOLS. THE STAINLESS STEEL THUMBSCREW AND TOOTHED JAW PROVIDE A TIGHT GRIP ON THE CIRCUIT BREAKER HANDLE SO DEVICE REMAINS SECURE. ITS COMPACT SIZE ALLOWS FOR LOCKING OUT VERTICALLY AND HORIZONTALLY ADJACENT BREAKERS. ALSO SUITABLE FOR MULTI-POLE BREAKERS AND TIE-BAR TOGGLES.