4″ high x 2 1/2″ wide x 1 5/8″ deep x 1/2″ shackle diameter. Bronze case chrome plated. Hardened steel shackle. High security Medeco cylinder uniquely installs from top of lock. Top load design inherently protects cylinder from being ripped from the lock. This lock was modeled after the Sargent & Greenleaf 826C military lock.Patent #’s 4063435 4635455 RE30243.