The Eaton Fuller Square Key, part number 16665, is a genuine Eaton Fuller manual transmission component used in gear retention and shaft alignment applications. This square key is sold individually and fits within the manual transmission gear category. Pro Gear and Transmission carries genuine Eaton Fuller drivetrain components for fleet and shop buyers. Not sure this is the right key for your application? Give us a call to confirm proper fit before ordering.Interchanges:HF16665FeaturesGenuine Eaton Fuller part number 16665Manual transmission square key for gear and shaft alignmentSold as individual unitCompatible with Eaton Fuller manual transmission applications