The Oxford OF8 Boss Alarm Lock and Chain measures 12mm x 1.5 metres and is Oxford's strongest ever lock with an integral alarm. This has been independently 5-year life-cycle approved by Thatcham and has ART4076 approval. This features a removable sealed unit alarm module that is water, vibration, frost and heat proof. This comes with batteries and a free minder cable, three keys and a replacement key service. The lock can be used as a brake disc lock or padlock separately and has a 100db alarm.