Heavy duty stainless steel construction with maximum corrosion resistance. Hardened rotary action double-locking steel shackle provides extra protection against hacksaw and cropping attacks. Laser-welded lock body limits moisture ingress and protects internal locking mechanism, which is double-bolted for extra strength to resist torsion and pull attacks. 5-pin cylinder increases protection against picking. Heavy duty stainless steel construction with maximum corrosion resistance. Hardened rotary action double-locking steel shackle provides extra protection against hacksaw and cropping attacks. Laser-welded lock body limits moisture ingress and protects internal locking mechanism, which is double-bolted for extra strength to resist torsion and pull attacks. 5-pin cylinder increases protection against picking.