This semi-round U bolt kit is built for Mack leaf spring suspension mounting and is sold as a 2-pack of identical kits. Each kit includes one semi-round U bolt, two washers, and two nuts, supplying the hardware needed to clamp the leaf spring to the axle housing and hold the assembly together. It fits Mack applications.Interchanges:6QK3106P77QK3152P3Mack 7QK357P7This unit is sold in packs of 2.FeaturesSemi-round U bolt designKit includes U bolt, 2 washers, and 2 nutsSold as a 2-piece packSuspension component categoryTech SpecsKit contents: 1x Semi-Round U Bolt (FUB-4779-001), 2x Washer (FWA-0180), 2x Nut (FNU-4719)Sell pack: 2 kits