-Stronger than the OE arms.-TIG Weld for strength;CNC for accuracy.-Black powder coat protection with strong tubular construction.-Control arms can work on springs or coilover kits.Fits:1958-1964 Chevy Impala 1958-1964 Chevy Bel Air 1958-1964 Chevy Biscayne 1958-1961 Chevy Brookwood