1-2-3 block (English, noun)
expansion: 1-2-3 block (plural 1-2-3 blocks)
Senses:
glosses: 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. May contain arranged holes. Similar, larger blocks are called 2-4-6 blocks.
Forms:
form: 1-2-3 blocks
tags: plural