The internal parts of a lock are made of brass and zinc. The cam is made of steel. The outer casing of the lock is made of any long-lasting metal. The locks are made from low security to high security locks.The low security locks are made from cheaper materials and can be customized also. On order of the customer it can be made according to the door. The key is made first, the key blanks are bought by the manufacturer and then the ridges are cut. The combinations are chosen by the manufacturer randomly and the keys are cut differently.