Specification:
Squareness on all sides within 0.0003 inch
Overall size is within +/- 0.0003 inch
Flatness and parallelism within 0.0003 inch
Pairs are matched to a tolerance of 0.0002 inch
Features:
Precision ground and case hardened to RC 55-62 on all six sides
23 each 3/8 inch through holes (5 tapped with 3/8"-16 threads and 18 untapped)