The term 'lock parts' refers to the components of a lock that work together to secure a door or other item. The three main parts of a lock are hairs, hasps, and TUMBLERS. Hairs are thin metal strips that are inserted into the lock and act as a barrier to prevent the lock from being opened without the correct key. Hasps are metal plates that are attached to the outside of the lock and provide additional security. TUMBLERS are small metal pins that fit into the lock and must be aligned in the correct order for the lock to open.