The SuperPro Roll Control two position adjustable front sway bar is 24mm solid and rear is a two position adjustable 22mm solid sway bar. Add in the SuperPro Adjustable sway bar links to: eliminate sway bar link flex maintain neutral sway bar positioning maximize all positions on the adjustable Sway Bars All this adds up to a vehicle that is a balanced upgrade by assisting tire grip and this becomes an ultimate handling package upgrade. From all our testing, this what we recommend as a good starting point: Stage one is to set both bars to the hardest setting and is ideally suited to a vehicle with standard suspension, wheels and tires. Stage two is to set the front to the soft setting and the rear to the hardest setting and is ideally to a vehicle with lowered springs, or with larger, wider wheels and tires. Stage three is to set both bars to the soft setting and is ideally suited to a vehicle with fitted with a coil over kit or sports suspension pack. This SuperPro Roll Control Sway Bar Kit will make the suspension system and tires perform better!