410 is a 3 x 2 x 1" engineering block it was and still is used to measure
sizes. the hole just make it a bit lighter. i could be a british invention
if its not recognized by you there in the us/canada.

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Connor Aston wrote:
410 is a 3 x 2 x 1" engineering block it was and still is used to measure
sizes. the hole just make it a bit lighter. i could be a british invention
if its not recognized by you there in the us/canada.



we have them here in the USofA. we call them 123 blocks....