1. Determine the load requirements: Rated Load: When selecting, the rated load of the pulley must be greater than the actual lifting weight (it is recommended to reserve a margin of 20%-30%). Common specifications include 0.5T, 1T, 1.5T, 2T, 3T, 5T, 10T, etc. 2. Chain Type and Length: - Chain Material: Alloy steel (such as G80 grade), with high strength and wear resistance. - Chain Length: Choose based on the lifting height (the standard length of single chains is usually 1.5-3 meters, which can be customized for extension). It should be noted that hand chain blocks should not be overloaded when in use.