When you are outside and there is no crane, no electricity power, you can use it to tighten and lift. Compared with the expensive and complicated crane, it is very cheap and practical. use method is simple. Please note that, For safety. It cannot lift people, Only materials and equipment can be lift. Method of use 1. Press the front shrapnel to separate the shrapnel from the gear. 2. Push the back spring onto it and the claw will separate from the gear. 3. Pull out the steel wire rope. 4. Push the back spring down and the claws will press the gear. 5. Shake the handle and the gear will roll up the steel wire rope to complete the tightening.