Not sure if this helps: https://en.wikipedia.org/wiki/Hex_key, but as far as I'm aware the metric designation for 'Allen' keys, is the distance measured in mm across the flats of the hex key.
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Not sure if this helps: https://en.wikipedia.org/wiki/Hex_key, but as far as I'm aware the metric designation for 'Allen' keys, is the distance measured in mm across the flats of the hex key.
Barry
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