2-4-6 block

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2-4-6 block (plural 2-4-6 blocks)

  1. A tool used in machining fields, especially milling, to aid in setup. It is a block of steel that is precisely squared and parallel whose sides are 2, 4, and 6 inches long, respectively. 2-4-6 blocks are a larger version of the more common 1-2-3 block.