This flat U bolt kit clamps the leaf spring to the axle housing on Mack applications, using a U bolt with washers and nuts to hold the assembly together and limit axle shift under load. It ships as a pack of two kits, each containing one flat U bolt, two washers, and two nuts.Interchanges:7QK3131P12Mack 7QK3154P3This unit is sold in packs of 2.FeaturesSold as a pack of 2 kitsEach kit includes 1 flat U bolt, 2 washers, and 2 nutsFlat U bolt: FUB-4769-001Washer: FWA-0180Nut: FNU-4719Fits Mack Universal applicationsTech SpecsKit contents: 1 Flat U Bolt (FUB-4769-001), 2 Washers (FWA-0180), 2 Nuts (FNU-4719)Fitment: Mack Universal