Premium Quality: Made of industrial glass filled with nylon material, complete insulation, strong wear resistance. Built to meet or exceed standard specification, and strictly follow factory quality control. Easy to Use: Universal, it can be installed on all kinds of miniature circuit breakers. Easy to use and portable. The circuit breaker can be locked in both open and close state to facilitate the management of maintenance personnel. Design: Humanized button design can lock the circuit breaker firmly to prevent misoperation. High Durability: mechanically tested prior to leaving the factory ensures optimal performance and enhanced durability. Perfect Replacement: Made by professional manufacturer, original standard, stable characteristics and excellent performance. Direct replacement for the old or broken one. Specifications: Material: metal + nylon Color: red Size: 4.2 x 2.5cm /1.65 x 0.98inch Weight: 7g Package includced: 1 x Circuit Breaker Lock