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Product Description
GU10 fittings have a bayonet mount with two pins at the bottom of the lamp. These pins are locked in clockwise into specials slots. Because this was the way bayonets were mounted on guns back in the day, they chose to name this type of socket after it. This is a fitting often used for halogen or LED lamps.
The numbers in the name, stand for the distance between the pins. So, with a GU10, there's a distance of 10mm between them.
Please keep in mind that there's a difference between GU10 & GZ10! A GZ10 lamp only fits in a GZ10 fitting, while a GU10, with its rounder base, fits in both. The “U” is an abbreviation for “Universal”.