These beauties are an exclusive for SYNH! What does this mean? It means that I had these made especially for us by design.
The actual INSIDE diameter is a perfect 1" square. The EXACT size of the Grommet width and height is 1 1/2" to the outside perimeter. So please make sure this size will work for you! These grommets attach with 4 screws..1 screw in each of the 4 corners. Sold in set of 4.