The American Lock No. A5201GLN Government Solid Steel Padlock features a 1-3/4in (44mm) wide zinc chromate finish solid steel body and a 2in (51mm) tall, 5/16in (8mm) diameter hardened boron shackle for superior cut resistance. Designed to stringent government standards, the 5-pin tumbler cylinder offers more than 10,000 key changes and a dual locking mechanism provides superior pry resistance. For added security, padlock comes with non-removable keys to ensure padlock is never left unlocked. BumpStop® Advanced Cylinder Technology protects against lock bumping.