The series 31, manufactured by Camlock, is a 10 disc double entry lock that provides above average security for lockers, mail boxes, drugs cabinets, deed boxes, chemical storage cabinets, tool cabinets and many other applications. It has been equipped with 5,000 key combinations and 1,000 more combinations may be acquired upon request. It provides the customer a 90° and a 180° turn option. The lock incorporates a positive-click index locking or unlocking action. This prevents the locking cam from falling back under its own weight if keys are left in the lock. It has a body length of 20 mm and is made available with a choice of fixing methods. Furthermore, it has a brass body nut or a horseshoe clip, and it fits a standard 19 mm x 16 mm double ‘D’ hole piercing.