[Compatibility] Suitable for use with standard BC lamp holders; ideal for lighting and lamp shade installations. [Dimensions] Features a 44mm outer diameter, 28mm inner diameter, and 1mm thickness for precise spacing. [Material] Made of solid brass for durability, corrosion resistance, and a clean decorative appearance. [Function] Helps secure lamp shades when the fitter hole is slightly oversized, ensuring stable installation. [Application] Can be used for functional spacing or decorative finishing in ceiling lights, table lamps, and fixtures., Manufacturer: LT Easiyl