Ensure the safety of all workers by keeping energy sources locked out until everyone is finished and centralising the location of your lockout supplies. Extra-large size holds up to 50 padlocks inside the lock box, and 53 around the box. The large size holds up to 30 padlocks inside and up to 24 around the box. Durable polypropylene moulded box, 6mm clear polycarbonate lid and stainless steel backing with hooks, includes self opening struts for ease of use. Can be mounted to rail or directly onto walls. Comes with clipboard spring on front of lid.