The present invention is directed to a shuttle device for a height safety system, the device including a first member having an inner wall defining a recess, the inner wall terminating at two sides to define a first opening. The device further includes a second member received in the recess of the first member, the second member being slidable relative to the first member to facilitate movement of the device between a locked condition and an unlocked condition. In the locked condition, the second member and a side of the inner wall define a second opening, the second opening being smaller than the first opening.