The Horton Engine Cooling Fan Clutch is designed to keep your engine running cool and efficiently. With a back pulley diameter of 6.85" and a front pulley diameter, this fan clutch is built to last. The overall length of the clutch is 9.12", making it a perfect fit for your Freightliner or Western Star truck. This fan clutch is a superior solution for some of the highest heat under hood applications. Its on and off operation reduces noise and conserves fuel, while its high torque capability allows it to turn larger fans. FleetPride is your First Click in Heavy Duty®.