Model No. A7300.2-1/4in (57mm) Solid Steel Rekeyable Tubular Cylinder Padlock. Keyed Different.Product Details.The American Lock No. A7300 Solid Steel Padlock with Tubular Cylinder features a 2-1/4in (57mm) wide case hardened, chrome plated solid steel body and a 1-1/8in (29mm) tall, 7/16in (11mm) diameter hardened boron alloy shackle for superior cut resistance. A dual ball bearing locking mechanism resists pulling and prying. The pick resistant rekeyable 7-pin AHTC12, tubular cylinder provides 50,000 key changes and meets NAMA standards.