Material and installation precautions: 3-pack all-metal structure combination cam lock, the original password is set to 0-0-0. There is a hole at the back of the lock, press the hole with a small stick, then select your new combination at the same time as you memorize this new combination and finally release it - your combination has changed. Features: This combination camera is magnetic, rewritable, economical and secure. Password Security: The 3-digit zinc alloy password makes it secure, with 1000 possible combinations, harder to break than 2-digit locks and cannot be forcibly removed. Versatile: used in school and home cabinets etc., no key in drawer applications, ideal for storage cabinets. Design: Lightweight and easy to carry. Also, there's no key in the lock, so don't worry if your lock gets lost. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.