American Lock AL52 The American Lock No. AL52 Solid Brass Blade Tumbler Cylinder Padlock features a 1-3/4in (44mm) wide solid brass body and a 3in (75mm) tall, 5/16in (8mm) diameter hardened boron alloy shackle for superior cut resistance. Dual ball bearing locking mechanism resists pulling and prying and a debris resistant cylinder performs extremely well in external applications. Model # AL52 Body Width 1-3/4in (44mm) Shackle Length 3in (76mm) Shackle Width 3/4in (19mm) Shackle Diameter 5/16in (8mm) Key Options Keyed Different, Keyed Alike (KA) Click HERE for additional key information. Color Options Brass - AL52, AL52KA 1-3/4in (44mm) wide solid brass body for maximum corrosion resistance Rekeyable, ABTC1 disc tumbler (blade) cylinder performs extremely well in external applications 3in (75mm) tall, 5/16in (8mm) diameter hardened boron alloy steel shackle BEST USED FOR: SEVERE USE Marine & Offshore Security Marine Environments Railroad Applications