You can just watch how to use it on you tube.
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Measure the diameter of the pulley. This tool works for sizes 1-1/8",1-1/4",1-5/16",1-3/8"
Removes and Installs pulleys with hubs that are 1-1/8", 1-1/4", 1-5/16" & 1-3/8" in Diameter