1. Keyed-alike: One single key can open all selected locks. Ideal for lockers and multi-door cabinets where users manage many locks with only one key.
2. Keyed-different: Every lock comes with its own unique key; keys cannot open other locks. Suitable for private drawers or separate storage units where independent access is required.
3. Master-key system: Each lock has its own user key for daily use. A separate master key can open all locks in the group. This is widely used in offices, schools, and rental properties for facility management.
