Diameter: 18 in. Finish: White Primer. Inside Diameter: 3-1/2 in.. Fits Canopies Up To: 4-3/4 in.. Projection: 1-5/8 in. Material: Polyurethane. Brand: Ekena Millwork. Hand Painted Option To choose one of our pre-made finishes: Click Here. For a custom made finish: Click Here.