U bolts are the permanent connection between your axle and frame. Skyjacker U Bolts are very simple to replace. These U bolts will add the extra strength you need to take on heavy loads and the challenges of the off-road. Skyjacker's Axle U Bolt Kits are precision bent and are zinc-coated to prevent corrosion and rust. Each kit includes a pair of U bolts, lock washers and nuts for easy installation. Depending on your vehicle, there are three different styles of U bolts: Semi-Round, Round and Square. Check your stock U bolts for the correct arch shape.