The H&R Street Perf Coil Overs 50418-1 are a set of high-performance suspension coilovers designed for street use. They are designed to improve handling and provide a more comfortable ride for vehicles. These coilovers feature a fully threaded shock body for adjustable ride height and damping, as well as progressive rate springs for improved handling and cornering. They are made with high-quality materials and are designed to withstand the rigors of daily driving. These coilovers are suitable for a wide range of vehicles and are a popular choice among performance enthusiasts.