The Master Lock No. 5424D Portable Light-Up Dial Lock Box features a 2-7/8in (72mm) wide metal body for durability. The shackle design offers over the door mounting for convenience. The large, easy to read light-up dials, combined with resettable combination functionality, provide a secure storage location for spare keys and access cards.

Precision Dial is the first resettable dial combination lock. The patented, ergonomic design was developed from a observational study conducted while watching students open their locker locks. We found several students did not use the center nub to dial in their combination, but instead would spin the outside of the ring with their thumb.