Kryptonite 512 Plug-In Chain Lock Plug and Play Commuters running a frame-mounted ring lock can turn it into a complete locking system with this plug-in chain. It plugs straight into the ring lock body so you can secure the whole bike to a rack or post. Features Plug-in design, connects directly to a compatible ring lock (sold separately)Stops ride, roll, and lift-away theft, when paired with a ring lock5. 5mm hardened steel links, resist cutting and tampering120cm length, enough reach to lock to racks, posts, and fences Kryptonite and AXA compatible, works with ring locks from either brand | Kryptonite | 512 Plug-In Chain Lock For Ring Lock 5. 5Mm 120Cm Length Black