Best used for electrical lockout applications as part of a comprehensive OSHA compliant lockout tagout safety program Lockout device hinges open for unobstructed normal operations of switch Patented design assures switch stays locked on or off Locks out both toggle and paddle wall switches with a padlock (sold separately) to help protect against switch operation during maintenance and repair Dimensions: 4-3/4 in. (121 mm) L x 1-3/4 in. (44 mm) W x 1 in. (25 mm) D; Accepts padlock shackle up to 5/16 in. (8 mm) in diameter (padlocks sold separately)