Big Red - Group 2 - 3 Wheel Combination Safe Lock. Three wheels offer approximately 1,000,000 possible combinations. Changeable 3 wheel combination lock with dead bolt for safes. Standard footprint retrofits most standard combination safe locks. Four way Drive Cam for mounting Right Hand, Left Hand, Vertical Up or Vertical Down. Internal Relocker Trigger to secure the lock bolt in the event of a punch attack.