Will fit most existing types of European circuit breakers. Requires NO TOOLS to install. The Lockout easily installs with the aid of a push button. The tie bar style Lockout has a convenient thumb wheel for quick application. Available for single and multi-pole breakers. Recommended to use in combination with a padlock for added safety. The lockouts can take padlocks with a shackle diameter up to 6mm. Manufactured from very strong glass-filled nylon. Pack of 6.