SuperPro 27mm Heavy Duty Non Adjustable Rear 4x4 Sway Bar Kit ,. SuperPro Heavy Duty 4WD sway bars offer increased grip, better handling and a more precise driving experience on and off road. Lifetime Warranty Greater Tyre Grip On and Off Road Designed, tested and made in Australia Heavy duty design built to take a hit off road Better handling, sharper steering and less body roll High torsional steel to maintain articulation If you are carrying heavier rear loads or If you want a more precise driving experience on and off road, than upgrading to a Heavy Duty SuperPro 4x4 sway bar is a must! SuperPro, with over 40 years of experience in the automotive industry has identified that fitting larger sway bars, particularly in the rear, has two main effects, vehicle balance in terms of understeer and oversteer, and increased roll resistance. Both effects can provide increased overall handling and safety benefits when driving 4WD. A larger rear sway bar, or the addition of a rear sway bar, helps in providing more neutral characteristic in the handling. This is due to the increase in roll stiffness at the rear, which changes the loading of the rear wheels under conditions of increased cornering load.