Close shackle hardened steel armoured cover over steel body and brass cylinder. Hardened steel rotating shackle prevents cutting with any type of saw. Anti-drill cylinder with ball-bearing locking mechanism. Includes 3 steel keys. Horizontal x vertical shackle clearance: 819718: 20x15mm; 380651: 30x25mm; 792082: 36x25mm. Shackle dia: 819718: 10mm; 380651: 12mm; 792082: 12mm