1)Name:fiberglass reinforced plastic / frp /grp square sewer drain cover2)Material:fiberglass&resin&other mixture3)Advantage:corrosion resistant,fire retardant,impact resistant,high strength,non-magnetic,non-conductive,non-sparking,light weight,easy to install,and easy to maintain.4)Size:40x40mm mesh Height:25mm,30mm,40mm