Each block is precision ground and case hardened on all 6 surfaces
Surface finish 6 to 16 microinches
Squareness on all sides to .0001"
23 holes: 5 tapped 3/8-16
Oversized to allow for normal tapping .0001"-.0003"
Case hardened to 50-60 HRC
Set consists of a pair of 1x2x3 inch blocks, give 3/8-16 stainless steel socket head cap screws and a hex key wrench

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Ultra Precision Ground 1-2-3 Blocks Set