Square Bend Body Bolt Kit, Grade 8, 5/8" Rod Diameter X 3-1/2" Inside To Inside Width X 18" Long Leg(Under center of bend to end of one leg), 5/8"-18 Fine Thread - Primary Uses: Mounting box bodies and headache racks to 3-1/2" wide frames. Kit includes: 4) U-Bolts - 8) U-Bolt Nuts - 8) U-Bolt Washers - 4) Straps