- A square-circle security lock is particularly designed for social security. It contains a good character and is especially suitable for those important places, such as families, warehouses, offices, and so on. 1. Against versatile key. The internal construction of the lock has been innovated and modified from the usual ball to the special multiple-layer one.
- So the versatile key can not turn on the lock in any way. 2. Against saw: Hardened steel shackles cannot be cut by a saw. 3. Avoid being prized devices containing very hard steel balls to pin the shackle and so strong that it cannot be prized by force.
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