The American Lock No. A1206BLK Solid Aluminum padlock features a 1-3/4in (44mm) wide aluminum, black body and a 2in (51mm) tall, 5/16in (8mm) diameter hardened boron alloy steel shackle for superior cut resistance. Dual ball bearing locking mechanism resists pulling and prying and 5-pin APTC12 rekeyable cylinder is pick resistant and has tens of thousands of key changes.