Lock and key matching work set: Includes multiple sets of mechanical locks, keys and password locks (initial password 000). Designed specifically for children over 3 years old. It helps develop hand-eye coordination and problem-solving skills through opening and locking Safe and suitable age metal material: The edges of the lock are smooth without sharp corners. The size of the key is easy to hold. The dial of the password lock moves smoothly and is not prone to getting stuck, allowing for easy operation. Small surprises can be placed inside the box to increase the fun factor, ensuring safe operation Fine motor skills and hand-eye coordination: The process of grasping the key, aligning it with the lock hole, and rotating or turning the password disc, exercises the fine control of the hands, the strength of the wrists, and the hand-eye coordination ability Difficulty level logic training: Start with a single set of mechanical locks, gradually increasing the number of locks; Password locks can have the password marked with a pencil on the red keychain (erasable), supporting multiple difficulty levels adjustment, cultivating observation and logical thinking Life skills and concentration: Through repeated practice, master various lock-picking methods, enhance concentration and task execution ability, gain a sense of achievement in successfully unlocking, and boost self-confidence