Group lock boxes can be used to assure all employees who are servicing the equipment that the energy isolation points will remain locked out until they've completed their work and removed their personal lockout devices.. Our extra-large metal lock box is made of heavy-duty steel and is powder coated for extra rust resistance.. Accommodates up to 12 padlocks (locks not included) and can also be used as a lock storage box holding up to 75 padlocks.