The Oxford Boss Alarm Chain Lock is a strong chain which also includes an alarmed padlock.PadlockAttack tested and resistant to sledgehammer, saw, bolt cropper and drill attackAnti-jack shackle design withstands 4.5 tonnes of tensile loadThe removable sealed unit alarm module is vibration-resistant and weather-proof against water, frost and heatVery loud 100db alarmCan be used as a disc lock or a padlockThree keys and replacement key service providedBatteries included (6 x LR44)Combine with 12mm hardened steel chain to give additional securityChain12mm square link chain made from Ni-Cro-Mo alloy steelCase hardened chain to resist bolt cuttersZinc coated to prevent corrosionProtective cloth sleeve to help prevent damage and make it easier to handleLong links reduce weight and increase portabilityFits all Oxford ground anchorsCan be easily stowed under the seatAvailable in three lengths: 1.2m, 1.5m & 2.0mThe padlock on the Oxford Boss Alarm Chain Lock has a 16mm shackle with an ear split