Seals-it 1 Hole Series Grommet GS100310 Specifications: 3" O.D. 5/8" I.D. Hole Made from a combination of fire-retardant rubber and anodized aluminum bezel. Keeps unwanted smoke and fumes from entering the driver's area. Protects lines or wiring from chafing and abrading on rough surfaces. They make a great finishing touch for your project. Installs with rivets or screws (not included). Qty 1 grommet