This is a mini moto 6mm / 25H chain split or break link tool, this enables easy removal and fitment of new links on 6mm / 25H chain only Fits mini quads, mini racing bikes, mini motards, some Blata machines, B1 replica water cooled racing bikes and other pocket bikes Split links also allow chains to break without breaking engine mounts and wheel hubs This will fit all mini motos with 25H chains or that are 9mm at their widest point