Sway-A-Way torsion bars are a high-performance direct replacement for your stock bars, available in a wide range of diameters to allow you to choose the right spring rate for your application. The bars are made with heat-treated aircraft grade alloy steel and centerless ground for vastly improved durability and consistent spring rate. Torsion bars are: Manufactured from solid aircraft grade alloy steel Heat treated for increased strength Centerless ground for consistent outside diameter and rate Powder coated to resist corrosion