lock : OnGuard Beast Chain (63 x 3/7 inch) (5018HD)

The Beast offers OnGuard's highest security rating for serious protection in high-risk areas. Its titanium-reinforced, 11mm-thick hexagonal links are nearly impossible to cut or break, while the 13mm, hardened-steel shackle resists picking and boasts 4 steel pins that engage at both ends to create a redundant, secure system. This lock comes with 5 keys, including one with a built-in light. The Beast is so strong, it's also approved for use with motorcycles and scooters.