Metric 1-2-3 Blocks
Description
Simply put, a 1-2-3 block is a common shop setup tool usually made of hardened steel that measures 1" thick × 2" wide × 3" long. Machinists use the blocks for myriad machine and inspection setup tasks. These however are Metric 1cm x 2cm x 3cm with 5mm x .8 threaded holes.
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