Granit CityChain X-Plus 1060The City Chair redefines the chain lock. The thick 10mm hexagonal chain links offer maximum resistance to cutting, pulling and torsion. Housed in a durable fabric sheath, this lock can be easily transported by winding it around the seat post without touching the bike frame. Comes with a lighted key for easy night time use. Abus security level rating: 15 (scale 1-15).