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Center Hole: 2-7/8"
Ball Shade Holderssupport glass ball shades and gas lampshades. Use on oil and electric lamp burners. For table lamps, chandeliers and wall sconces. Decorative border accents lamp shade base.
Holder is a 4" ring which sits down on lamp burner. To install, fold tabs down around outside edge of burner to secure ball shade holder. For lamps where glass shade sits upright, cannot be used for shades which hang down. Fits most #2 Brass & Brass plated oil & electric burners.
Center Hole: measure outside diameter of burner ridge, where chimney is seated. Fitter: measure base diameter of ball shade.