2-3-4 Precision 23 Hole Block Set. ~ Accuracy with squareness on all sides within .0001″ per inch. ~ Sold in a matched pair. ~ Hardened and precision ground on all 6 sides of each block. ~ 23 holes consist of 5 tapped holes that are 3/8″-16 thread for clamping and 18 untapped holes. Accuracy with squareness on all sides within .0001″ per inch. Sold in a matched pair. Hardened and precision ground on all 6 sides of each block. 23 holes consist of 5 tapped holes that are 3/8″-16 thread for clamping and 18 untapped holes.
