Abus Catena 6806K Chain Lock: Blk 75cm6 mm square chain with textile sleeve to protect against damage to the paintwork The chain is made of specially hardened steel Very practical use because only one end of the chain must be locked 03 is reflective TECH SPECS Internal Lock Size Imperial 3. 3 Primary Color Black Internal Lock Size Metric 85cm Lock Type Key Bracket No Thickness In mm 6mm