The Buyers Products UB623516 Square Bend U?Bolt Kit is a complete hardware solution for securely mounting truck boxes or connecting truck bodies to chassis frames. Designed for commercial applications, this kit includes four 16 inch square bend 5/8 in. U?bolts, eight 5/8 in. hex nuts, eight split lock washers, and four forged steel tie bars. The 1/2 in. thick forged tie bars help distribute clamping load evenly, improving stability and long?term mounting performance. Grade 5 equivalent hardware provides dependable strength for demanding truck body installations. The square bend design helps maintain a secure fit around frame rails to reduce movement over time. Each kit is individually packaged for convenient storage and handling, making it well?suited for fleets, upfitters, and service professionals who require reliable, professional?grade truck body mounting hardware.