The Hendrickson Auxiliary Axle Concentric Collar is a practical and reliable solution for your suspension needs. With an inner diameter of 7/8" and an outside diameter of 4", this collar is zinc plated for corrosion protection, ensuring durability and longevity. Designed to be used with Hendrickson Quick-Align Suspensions with Tri-Functional Bushings, this collar fits OE parts such as Automann MHS97, Dayton Parts 334-1574, Euclid E-10755, Flagg HT244, and Hendrickson Auxiliary Axle S-20924 / C-20924. Sold individually, this collar is a must-have for any suspension system.