Our new JK rear long arm brackets are designed to be 100 percent bolt on. We spent countless hours designing these 1/4 inch brackets in 3D Solidworks providing you a superior fit.These brackets bolt on using eight 1/2 bolts to interior brackets. The interior brackets have preinstalled pem fasteners to easily and securely hold all your bolts in place. This provides a superior clamping force then trying to clamp the entire frame.These brackets incorporate both upper and lower long arm mounts providing you the ability to run 4 true long arms in the rear of your JK. Both upper and lower mounting locations use a 9/16 bolt, and have a 2 5/8s inside diameter. Production parts will be e-coated for corrosion resistance.