Made from durable reinforced nylon, this locking mechanism will stand the test of time. It's built to last, ensuring it remains reliable and effective even in the most demanding environments. Whether in an industrial setting or a commercial space, this locking device is up to the task. One of the standout features of this device is its keyhole diameter of 9 mm. This size has been carefully selected to provide maximum security and flexibility. With this locking device, you can easily and safely lock circuit breakers of different sizes without worrying about safety issues.