1-2-3-block definition

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.
noun
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Other Word Forms

Noun

Singular:
1-2-3-block
Plural:
1-2-3-blocks