Kryptonite 912 Plug-In Chain Lock - For Ring Lock 9mm 120cm Length BlackPLUG 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 Kryptonite and AXA ring locks plug in options are compatible TECH SPECS Internal Lock Size Metric 1200mm Bracket No Internal Lock Size Imperial 47. 24 Thickness In mm 9mm Primary Color Black