2000-2005 Superduty Excursion 4WD Round U-Bolt Kit 5/8-18 x 12.00 x 3.50 (FABFTS351UBK)This round U bolt kit is designed for heavy duty axle mounting applications and provides a direct replacement solution when installing or servicing suspension components that require 5 8 inch hardware. Features Round U bolt design for secure axle clamping 5 8 inch diameter hardware with fine thread pitch Steel construction suited for suspension and axle use Notes U bolt dimensions are 12 inches in length and 3. 5 inches in width Thread pitch is 5 8 18