Buyers Products Square Bend U-Bolt Kit with tie bars and hardware is a complete kit for mounting a body or a truck box to your truck chassis. The kit features durable Grade 5 hardware and is available in a variety of lengths. It contains the following: four square bend 5/8 in. U-Bolts, eight 5/8 in. hex nuts, eight 5/8 in. split lock washers and four 1/2 in. thick tie bars. Tie bars are forged steel construction for superior strength.