The Lockwood 312 Safety Lockout Series Padlock is a durable and rugged 30mm brass padlock that has been specifically designed to meet the requirements of safety lockout applications. Multiple departments or jobs can be easily identified using one of the jacket options. Solid brass case extrusion 4.8 mm stainless steel shackle 6 pin tumbler mechanism Self latching or deadlocking (key retained) Double locking Extended shackle models.