Integra 431 Series Steel Twin Tube shocks are a rebuildable design featuring the Integra high-quality performance you expect. Revolutionary Deflective Disc Valve design makes each 431 series shock very consistent throughout the entire velocity range. If desired, Integra 431 series shocks can be mounted upside down to reduce unsprung weight! Additional design features include a 12mm shaft diameter, and a 1.75" outer diameter body as well as the convenience of being owner serviceable, revalvable, and repairable.