ONE SET 1-2-3 BLOCK WITH ONE HOLE AND ONE SET 1-2-3 BLOCK WITH NO HOLE One set 1-2-3" block with one hole One set 1-2-3" block with no hole 0.0003" squareness per inch Size within +/- .0002" Flatness .0002" Parallelism Made of hardened steel Hardness 56-62 Precision ground on all
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