Cover and bolt are 304 stainless steel offering rust and corrosion resistance Easy installation with phillips screw driver ADWS - Rubber (CR) base has excellent weather resistance ADWHS - Ethylene propylene base is non-marring, non-abrasive and has excellent heat/weather resistanceWARNING: This product can expose you to chromium, nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65WARNINGs.ca.gov.