This is a new style alignment cam far superior to the traditional eccentric cams. The new OctoCam alignment cam washers allow for 5-position adjustability for caster on the front axle or pinion angle on the rear axle. The cams work with the factory control arm hardware and will not slip under load like traditional eccentric cam setups can. Available in sets of four, each set of OctoCams will complete one axle. Buy two sets if you'd like to use them on your front and rear.