Experience reliable lockout safety and effortless installation with the Clamp-On Circuit Breaker Lockout. Simply twist the proprietary thumbwheel design for tool-free application.Fits a wide range of single-pole and internal-trip multi-pole breakersDetachable cleat expands the range of applicable breakersMade from fiberglass-reinforced nylon for durability in demanding environmentsTamper-resistant features help prevent unauthorized removalConvenient size for easy transport and storageAccepts padlock with shackle diameter up to 0.28 in.