A: We provide three locking structure, 1) lever lock one-piece, lock lever, the most convenient and quick switch 2) lock lever type split type lock core, open the door need to play the lock core, and then press the lever and then grilled outside lever can open the door 3) button on the lock core one-piece, this is the surface only a dovetail handle in the middle of a lock core, after the lock core in the middle lock core, can open the door.