1 Pair 2-3-4 Blocks Matched Pair 23 Holes 234 Precision Ground Machinist Set Up Blocks 0.0003 inch HRC 55-62

Matched pair 2-3-4 blocks includes 2 blocks Accuracy and squareness on all sides within 0.0003" Overall size is within +/- .0003"; Flatness and parallelism within .0003". 23 through holes (5 tapped 3/8"-16 TPI and 18 plain) Made of precision-grade tool steel hardened and ground on all 6 sides of block, heat treated and case hardened to HRC 57-62