8" dia., I.E.S Opal Reflector I.E.S. white opal glass reflector shade, 8" IES Diffuser 5 3/4" height, 8" top diameter Height: approx 5 3/4 inches.Flare Rim Width: approx 8 inches diameter.Fitter Neck Opening: approx 1 5/8 inches diameter.Fitter Width: approx 2 3/16 inches diameter to outer edges,