The principle and structure of copper lock？

Lock body: usually made of brass (copper zinc alloy), with both hardness and corrosion resistance, containing precision components such as lock core and pin inside.
Lock core: The copper lock core has multiple pin holes inside, each hole containing two rows of pins (drive pin and stop pin), which are compressed by springs.
When the key is inserted, the serrated teeth push the pin to a specific height, aligning the boundary between the upper and lower pins with the shear line between the lock cylinder and the lock body, before rotating to unlock.
Lock tongue/lock beam: linked with the lock cylinder, the lock tongue is retracted or released by rotating the key to achieve locking and unlocking.