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British Made Lampholder SBC / B15 ½" Threaded Entry Shade Compatible (Lock Rings Included) Height: 37mm, Width: 23mm This high quality, delicate product is ideal for smaller sized lights that have shades with a 20mm internal diameter ring. It mounts on a half inch thread, but can be reduced to 10mm using our half inch to 10mm reducers. Often used with pygmy bulbs. Fits a 20mm shade hole.