Rio round core-drill spigot & dress ring or 27mmH domical cover Stainless Steel 2205 is a superior duplex stainless steel. It features elevated levels of chemical components enabling superior strength and corrosion/pitting resistance. SS2205 is commonly used in harsh marine environments. Core Drill Advantages: Made from stainless steel 2205 Stylish round shape M10 bolt at bottom enables: up to 60mm of vertical height adjustment, a contact point for earthing if required, extra anchoring in footings. Recessed friction plate for neat finish & ease of installation For 12mm glass Available in white, satin and polish