The 2” tall mounting brackets act as fulcrum points on the underside of the SuperSpring and the shackles at each end of the springs secure it in place; pivoting as load is transferred to the springs. The mounting brackets are bolting to the vehicle spring pack on either end using the u-bolts, cross plates, washers and nuts provided. All nuts provided are nylok self-locking and will not loosen when correctly installed. After installing the mounting bracket, tighten the u-bolt nuts while the vehicle is off the ground. After our springs are installed and the vehicle is on the ground retighten the u-bolt nuts.