The Euclid 1-3/8" Wheel End Flange Cap Nut is designed to provide a secure locking mechanism for the wheel. The flanged cap nut has a height of 1-3/8" and is designed for hub piloted wheel system applications. Its stud pilot design allows for faster and more accurate wheel alignment. This cap nut is a reliable and durable solution for your wheel end needs. FleetPride is your First Click in Heavy Duty®.