Mnpctech 120mm Overkill "ROG" Billet Fan Grill was inspired by ASUS Republic of Gamers. It's CNC machined from 1/2" thick 6061 Aluminum. They fit all 120mm size PC Cooling Fans. Outer dimension measures 5" x 5" These grill designs raise the bar for your custom PC build. Mount over your front intake, top of your case or side panel. Mounting over rear exhaust fan may require modifying your chassis and side panel.