Chain block, also called hand chain hoist, a kind of lifting machines which is easy to operate and convenient to carry. It is suitable for lifting if small device or short distance. 100 tons is the maximun capacity as usual. The main part of the hoist is made of  high-quality alloy steel, which is wearable and highly safe. When lifting  cargoes, go clockwise to  pull the chain, and then hand chain wheel be rotated; when going  down,  go counterclockwise to pull the chain, brake block be released from the  brake seat, ratchet resting under the effect of the pawl, five-tooth-axis drive the lifting chain to the opposite direction, the cargoes will be came down from that way smoothly.