Value Callection Top Quality 1-2-3 Block Set – 52-800-1

0.0003 Squareness Per Inch, Hardened Steel, 1-2-3 Block with 23 Hole Setup Block 0.0001 to 0.0007 Inch Overall Tolerance, 3/8 – 16 Inch Tapped Hole Size, 56-60 HRC Hardness, Sold As Matched Pai

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