Rainbird Plastic Square Flat Grate, Black, 18" Manufactured from structurally foamed High-Density Polyethylene (HDPE) - UV stabilized to protect from sun degradation Flat and atrium (domed) profiles - Flat grates available in green and black - Atrium grates available in green and black Fits 9", 12" and 18" Square Catch Basins - Fits 9" and 12" Square Low-Profile Basins Textured anti-skid surface - Load rated for pedestrian traffic - Load rated for autos and light trucks at speeds less than 20 mph ADA compliant - Made in the USA