Product information updated on 2021-08-25, Manufactured by BDS Suspension - Part Number BDS:UBT4068, 9/16 x 4 x 16-1/4 Round U-bolt, , U-Bolt Features All components are zinc plated All 1/2", 9/16", and 5/8" u-bolts come with high nuts and washers. All 5/16", 3/8", and 7/16" u-bolts come with prevailing torque nuts and washers.