Atrium Grate - 6 inch Round Black. Atrium grates are ideal for planter beds, mulch areas, window wells and areas prone to debris collection. This grate helps to collect and remove excess water from driveways, patios and any other outdoor areas, designed for maximum durability to handle light foot traffic. NDS grates are a proven alternative to traditional concrete drains with UV inhibitors are used to prevent fading and cracking from the sun, chemical-resistant, rustproof and maintenance-free, lightweight and easy to install. Can be used with sewer and drain pipe and fittings, corrugated pipe and triple wall pipe.