Inside Diameter: 2 inches.
Outside Diameter: 3.135 inches.
Need some heavy-duty grommets that look great too? The C.S. Osborne #15 Large Grommets are perfect. You have options with finishes including brass, nickel, antique, and black. These grommets are tough enough for curtains, draperies, canvases, awnings, and even tarps, and they can handle heavy winds and salty sea air.