1. Confirm the lifting point: The fixed point must be able to withstand the weight of the rated load multiplied by 2 (that is, the safety factor is 2), and it must be located directly above the heavy object when lifting vertically. 

2. Installation and fixation：

· If it is hung on the lug: confirm that the welding direction of the lug is consistent with the direction of force. 

· If it is hung on the beam/anchor head: hang the upper hook firmly and close the safety pin to prevent it from falling off. 

· If used with sports cars: when adjusting the width of the pulley, the load-bearing hanging ring must be installed in the center of the load-bearing shaft. 

3. Trial operation：

·No-load test: Pull the zipper strip to check whether it is flexible and whether it is stuck. 

· Load test: Suspend a heavy object with 1.25 times the rated load, about 10cm from the ground, keep it for 10 minutes, and check that there is no deformation or slippage to pass.