1-2-3 Blocks Single 1/2" Hole Matched Pair (2 each), Hardened Steel RC 55-62, (1"x2"x3") 123 Precision Ground Machinist Set Up Blocks TTW123SH
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Feature
Matched pair 1-2-3 blocks includes 2 blocksProfessional quality precision ground steel and case hardened to RC 55-62 on all six sides
Squareness on all sides within 0.0002"
One single 1/2" untapped through hole
Overall size is within +/- .0002"; Flatness and parallelism within .0002".