Kryptonite 912 Plug-In Chain Lock Plug and Play Commuters and e-bike riders running a frame-mounted ring lock can step up to a heavier 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, works with Kryptonite retractable or non-retractable ring locks (sold separately)9mm steel chain links, heavier-duty protection than the 5. 5mm chain option120cm length with nylon sleeve, generous reach that won't scratch your paint Kryptonite and AXA compatible, works with ring locks from either brand E-bike approved, ready to protect higher-value rides | Kryptonite | 912 Plug-In Chain Lock For Ring Lock 9Mm 120Cm Length Black | Nylon