Supreme protection with 6 superiorties. 1. Safe Computerized 6-PIN TUMBLER Key system with more than 260,000 combinations. 2. Durable Stainless steel 304 knob, fortified with hardened steel, more than 500,000 cycle tested. 3. Long Extra long latch embedded with hardened steel. 4. Strong Automated assembled of galvanized cold-rolled steel body, 1.4mm thickness. 5. Firm Patented screws for higher protection. 6. Convenient Solid brass key suitable for Master key and Keyed Alike.