COMBINATION LOCK / NUMERIC LOCK
Combination Lock is an Arab innovation that dates back many millennia. This lock is used in a range of mechanisms, including ring, roller, wheel, and puzzle locks, as well as combination, letter, number, and word locks. This locking mechanism consists of a single dial that must be spun left and right in a certain sequence to unlock the lock. Apart from this, Combination Lock is now used for a variety of purposes, including locking bicycles, mopeds, doors, gates, and so on. It is an unkeyed padlock mechanism that is widely used to protect safes.