Kryptonite Lock Keeper 785 Integrated Chain Key 7 x 850mmProduct Details Closure technology works without a separate closure head, leaving no point vulnerable to weakness. The last link of the chain forms the locking head and thus a strong closure. Reinforced high security disc cylinder lock secured against picking and drilling. Features 850 mm long, 7 mm thick square chain links Made of extra hard 3t manganese steel Weatherproof nylon cover protects the bike from scratches and allows compact folding of the