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UNO Lampshade Fittings
Typically used in the US, these fittings sit directly inside a specialised light bulb socket, secured by a threaded ring held in place by the light bulb. They require no additional parts to attach light to shade. A threaded ring attaches around the light bulb base, either facing upwards or downwards. If your lampshade is for a ceiling light, the threaded ring and spokes will be situated at the top of the shade and if it's for a table lamp, they will be on the bottom. Euro or European fittings (ES) are 4.2cm or 1 9/16" in diameter, whereas UNO fitter lampshades have a smaller inner fitting and should measure 3.2cm or 1.25" in diameter.