New Ultra Precision 1 Matched Pair 2-3-4 Blocks 23 Holes .0002" Precision

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       This is a matched set (2 each) of professional quality 2-3-4 blocks They are precision ground and case hardened to RC 55-62 on all six sides. They contain 23 each 3/8 inch through holes (5 tapped with 3/8-16 threads and 18 untapped). Overall size is within +/- .0003". Flatness and parallelism are within .0003". Squareness on all sides to within 0.0003". Pairs are matched to a tolerance of 0.0002". There are 2 pieces per set.