A drive axle U-Bolt is used to attach the axle to the frame of the vehicle via the leaf spring. When replacing the axle, many installers cut off the U-Bolt, rendering them unusable and requiring the purchase of new ones. Also, the threading on certain applications causes the bolt to wear over time, interfering with proper operation. CARDONE 100% New Drive Axle U-Bolt Kits are manufactured in the U.S.A. and provide easy installation with O.E. fit and function.