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definition of the word 1-2-3_block

by the Wiktionnary

1-2-3 block (plural 1-2-3 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 1, 2, and 3 inches long, respectively. Similar, larger blocks are called 2-4-6 blocks.
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