Buyers Products UB623520 U-Bolt Kit (U-Bolt Kit 20In,(4 Ea) W/ 4Inch N.C. THD) 20" in length Kit includes (4) square bend 5/8" U-Bolts; (8) 5/8" hex nuts; (8) 5/8" split lock washers; (4) 1/2" tie bars Grade 5 equivalent