findmall 1 x 2 x 3 Inch Blocks Matched Pair 1/2" Single Hole Matched Pair with One Hole Hardened Steel Accuracy Ground Machinist 123 Blocks Set Up Blocks Fit for Accuracy Grinding Layouts

This is a matched set (2 each) of professional quality 1 x 2 x 3" blocks.

High Accuracy Steel Overall size is within +/- .0002" Flatness and parallelism are within .0002" Squareness on all sides to within 0.0003" Pairs are matched to a tolerance of 0.0002" They are high accuracy ground and case hardened to RC 55-60 on all six sides; They contain one untapped 1/2 inch through hole;