This chain lock features Oxford's strongest ever lock with an integral alarm. The padlock has a 14mm shackle and an ear-splittingly loud 100bB alarm which is triggered by movement sensors (the padlock can also be engaged without setting the alarm). Combined with a 12mm hardened steel chain, available in 3 lengths, the Boss Alarm Chain Lock will put off any would-be bike thief.Attack tested and resistant to sledgehammer, saw, bolt cropper and drill attack.Anti-jack shackle design withstands 4.5 tonnes of tensile load.The removable sealed unit alarm module is vibration-resistant and weather-proof against water, frost and heat.Very loud 100db alarm.Three keys and replacement key service provided.12mm square link chain made from Ni-Cro-Mo alloy steel.Case hardened chain to resist bolt cutters.Zinc coated to prevent corrosion.Protective cloth sleeve to help prevent damage and make it easier to handle.Long links reduce weight and increase portability.The Oxford Boss Alarm Chain Lock has been