● With self intellectual property rights. ● Multi-point supporting.Low fault rate. ● With double pawl,increase the safety factor in 2 times. ● All nuts in anti-slip nuts. ● Thick cover with the convex rib process, protect the inside partseffectively. ● Hand chain cover is in unique curled edge to provent the noise and seizure. ● Integral gear increases the service life. ● With CE approved. ● Option: overload protection device is available.