This Glass Piece can be used for a Ceiling Fan or Light Fixture that requires a 3 1/4 inch neck. This glass piece is brand new and are very unique looking. The outside diameters of the neck is 3 1/4 inches and the inside openings is 2 5/8 inches. The dimension are 5 7/8 inches tall and 5 1/4 inch before the neck. The width of the pinapple glass at the widest point is 5 1/2 inches. This piece is packaged well for safe arrival.