The middle tier is 18 in diameter and 3 in height. Its dimensions are 20 3/4 to the top of the light socket. 1/2 x 6 in width and depth.
Let us know if you have questions. The item "LARGE Vintage Retro 3 Tier Fiberglass Lamp Shade Atomic Mid Century Modern" is in sale since Tuesday, May 28, 2019. This item is in the category "Antiques\Periods & Styles\Mid-Century Modernism". The seller is "50sfunk" and is located in Columbia, Missouri. This item can be shipped worldwide.