New trailer U bolt kit for 3500lbs 2-3/8" Round Axle 5-1/2" long 1/2" dia -20079 This kit is for 3,500lbs round axle which axle beam dia 2-3/8" . 4 x 5-1/2" long U bolts, U bolts dia. 1/2" 2 x tie plates for 1-3/4" leaf springs 8 x 1/2"-20 hex nuts