This chain lock features Oxford s strongest ever lock with an integral alarm. The padlock has a 16mm 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, SBSC and ART 4*. 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.