1, 8-ring handleless descent control device. When in use, the rope is folded through the big circle and then wound around the big circle and the small circle as a connection with the safety belt. The 8-ring principle is to use the friction between the rope and the descender to slow down the descending speed or brake, which is a common descender.
2. 9-shaped ring descent control device with handle. When in use, rotate the rope in the handle for half a turn, wind the rope in the opposite direction of the handle, and press the upper rope on the lower rope in the correct state to test whether the downward force slips. 9-character circle is simple, fast and labor-saving, suitable for beginners.