Kryptonite Ring Locks mount to the frame using a flexible mount bracket and allow locking the wheel which prevents roll, ride and lift-away theft. Add-on chain lock for the Kryptonite Ring Lock SPECIFICATIONS & FEATURES 9mm PLUG-IN CHAIN to be used with either retractable or non-retractable ring lock Ring lock and plug-in chain PREVENTS ROLL, RIDE, AND LIFT away theft Plug-in options also include a 5.5mm chain and a 10mm cable Kryptonite and AXA ring locks/plug-in options are compatible 9mm steel chain links 120cm long