The ring chain wrench can be used for traction and lifting up and down. 1. Working principle: By reciprocating the handle, it drives the driving gear, which in turn drives the hoisting sprocket, causing the chain to rise and fall. When operated in reverse, the brake automatically locks with spring force to ensure safety. 2. Operation steps: 1. Secure the upper hook on a reliable support point (such as an I-beam). 2. Adjust the position of the lower hook to ensure that the center of gravity of the load is vertical. 3. Operate the handle at a steady speed to avoid impact loads. 4. Slowly release the brake when lowering to prevent free fall.