123 Machinist Blocks 123 blocks, 1-2-3 blocks, 1 2 3 Blocks

123 Machinist Blocks (CB-50301)

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Matched Pair, 23 holes, 5 with 3/8"-16 Threads. Hardened (RC55 Min) and Precision Ground to .0003"Squareness and .0002" Parallelism.
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