Libra New Trailer U Bolt kit for 2000lbs 1-3/4" Round Axle 4-1/4" Long 1/2" Dia -20078 This kit is for 2,000lbs round axle which axle beam dia 1-3/4" . 4 x 4-1/4" long U bolts, U bolts dia. 1/2", stronger than regular 3/8" dia bolts 2 x tie plates for 1-3/4" leaf springs 8 x 1/2"-20 hex nuts