Brass pad lock

Brass pad lock is one kind of copper lock,General cylinder is made of copper or aluminum, and copper used in copper cylinder is brass (with zinc as the main alloying element of copper alloy known as brass. Brass with + H; (yellow) indicated that if the H80, H70 , H68, etc.) Long history of locks. The first lock of wood, construction is extremely simple, just as a symbolic lock, there is no anti-theft feature. China's metal lock invented in the Han Dynasty. Song mostly locks, and to the Ming and Qing, helium and become every household necessities. As a life necessities, recorded in different periods of ancient lock level of development of social productive forces, some of the special form, the lock engraved pattern was also recorded folk customs.