100% bolt-in 304 stainless steel design for 4x4 or 4x2 models. No more peeling powder or rust. Kit includes stainless hardware, composite DOT push-to-connect fittings and a single DOT air fill line that tee's off to both springs. Air springs are rated at 5,000 lbs. and max 500 PSI. Provision for lift kits is designed in with an additional purchase of a spacer kit. Please contact us for your application.