The American Lock A707KA Solid Steel Padlock, Keyed Alike – multiple locks open with the same key – features a 2-1/2in (64mm) wide case hardened 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 6-pin APTC14 rekeyable cylinder with serrated pins is virtually impossible to pick.