Product Features Disc brake lock alloy Security lock is particularly designed for the social security, It contains a good character, and is specially suitable for those important places, such as family, warehouse, office and so on. Features 1. Against versatile key The internal construction of the lock has innovated and modified from the usual ball to the special multiple layers one. So the versatlle key can not turn on the lock in any way. 2. Against say Hardened steel shackle can not be cut by saw. 3. Avoid to be prized The device contains very hard Arsteel ball to pin the shackle and it is so strong that is can not be prized by force. 4. Against drill Hardened lock shaft cover can be against drill.