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.The Oxford Boss Alarm Chain Lock has been independently tested and approved by Sold Secure and has been awarded Powered Cycle (Motorcycle) GOLD standard and SBSC. Insurance discounts are available in the UK when you use this lock.This lock has a key replacement service. When you buy your lock, simply note down the number which comes either attached to the keys on a metal tag or is laser marked on each key. Padlock - 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. - Can be used as a disc lock or a padlock. - Three keys and replacement key service provided. - Batteries included (6 x LR44). - Combine with 12mm hardened steel chain to give additional security. Chain - 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. - Fits all Oxford ground anchors. - Can be easily stowed under the seat. - Available in three lengths: 1.2m, 1.5m & 2.0m.