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There is a design devote to make the back seat of the bicycle with the function of lock.
The lock is connected with the axle of the back seat,the size of the bicycle lock is same with that of the back seat,and they can overlap completely.Thelock can be rotated 360 degrees.The keyhole is located in the side of the back seat lock.When unlocking the lock，you need to turning the back seat in the same time.Turning the lock 180 degrees ,the surrounding fence or something other can be locked. Roll the seatback cover downward,the rear wheel of the bike can be locked.