A handy chromoly steel compressor designed to fit inside most coil springs with an internally mounted shock. Will accomodate spring lengths from 8-1/4" to 14". It can be used on any coil spring with a minimum inside diameter of 3-3/8" to a maximum inside diameter of 5-5/8" and wire diameters up to 3/4". NOTE: NOT for use on MacPherson struts or Fiat vehicles. California Residents WARNING