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The Square Atrium Grate, available in 9" and 12" sizes, is a durable, square, domed grate designed for use with a catch basin. The large opening slots allow for maximum flow while still preventing large debris from entering the drainage system. Typical application would be areas where floating debris would block a flat grate. This product is available in green and black. For safety, and to reduce vandalism or theft, the grate has two holes for securing it onto the basin. This style of grate is not suitable for pedestrian and bicycle traffic. Features: Manufactured from structurally foamed High Density Polyethylene (HDPE); UV stabilized to protect from sun degradation; Available in green and black; Fits 9" or 12" catch basins; Includes two holes to secure to basin (use #6 x 1.5" flat Phillips head stainless screws); Made in the USA; Specifications9" Square Atrium Grate12" Square Atrium GrateDimensions8.90″L x 8.90″W x 4.5"H11.75″L x 11.75″W x 4.5″HWeight0.65 lbs1.30 lbsOpen Area31 sq in50 sq inSlot Width3/8"7/16"Flow Rating40 GPM65 GPM