The SoCal Diesel Valve Cover Grommet Kit is 100% stainless steel for maximum corrosion resistance. The kit contains precisely engineered bolts and bushings that will provide proper/even clamping force to your valve covers and prevent valve cover distortion to insure a leak free seal. The Valve Cover Grommet Kit can be installed on both SoCal Diesel Billet Valve Covers (sold separately) or on factory valve covers!