The American Lock A703KA Solid Steel Padlock, keyed alike – multiple locks open with the same key – features a 2-1/2in (64mm) wide case hardened, zinc plated solid steel body with a 2in (51mm) tall, 7/16in (11mm) diameter hardened boron alloy shackle for superior cut resistance. A dual ball bearing locking mechanism resists pulling and prying. For extra security, the 5-pin APTC12 rekeyable cylinder with serrated pins is virtually impossible to pick.