9", Black, Square Structural Foam Polyolefin Grate With UV Inhibitors, Open Surface Is 28.40 SQIN & It's 37.20 GPM, Fits Speed Basin, 6" Sewer & Drain Pipe & Fittings, & 6" Corrugated Pipe, Loads Of 1-60 PSI, Recommended For Pedestrian, Bicycles, & Wheel Chair Traffic.