Ideal for medium to high risk of theft, the RICH DOOR padlocks are recommended for a wide range of security requirements. All models in this series have a paracentric keyway, zinc alloy plated cylinder cores, and a hardened steel shackle. Unique Lock core1. The key steps for 0.05mm;2. Leaf-blade error 0.01mm;3. The locking plate and a locking groove clearance are 0.1mm;4. Spring leaves and the single type, as long as any side force cannot be opened;5. Stainless steel lock, super anti-violence on;6. The magic key to change and the error is 1, then automatic idle cannot be opened. Hard to Duplicate The padlock comes with 3 keys which is important as the keys are too unique to duplicate easily.Hard to be Cut Off The lock is built to resists being picked by a shim (along the sides of the shackle) and also has a unique internal mechanism that is more difficult to pick. And, because there is a metal barrier that blocks the shackle, it is also more difficult to clip with bolt cutters.