Setup Blocks - MSC Industrial Supply
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 Pair. MSC# 06378012 Value Collection
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