2015+ Ford F-150 pinion shim kit dials in pinion angle on lowered trucks to reduce or eliminate lowering induced vibration. Lowering the F-150 makes it look great but proper driveline angle makes it drive smoothly. Strong 6061-T6 aluminum shims feature a 2.5 degree taper. Natural finish. 100% Made in USA. 2.5 degree taper Bare aluminum finish Direct bolt on Includes two shims 100% Made in USA