Smooth ball design Solid brass that is unfinished Measures 3/4 inches tall and the ball has a 5/8 inch diameter Tapped 1/4-27, which is the size for standard harps B&P Lamp Solid Brass Sphere Style Unfinished Brass Finial, 3/4 Inch Height, 1/4-27 Tap - Sphere style solid brass finial, 1/4-27 tap base for use on standard harp. Features Include: Smooth ball design, Solid brass that is unfinished, Measures 3/4 inches tall and the ball has a 5/8 inch diameter, Tapped 1/4-27 which is the size for standard harps