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Garage Door 4" Sheave Pulley with Stud
Zinc plated
4" Diameter Pulley
9/16" diameter mounting bolt
Stationary pulley with mounting bolt for garage door extension spring system. If your garage door does not run smoothly, one of the issues may be defective bearings in your pulleys. Replacing the pulleys will help your door run more smoothly and reduce stress on your garage door opener.