About the product
- This matched pair of blocks is ground to tolerances of 0001 23 holes 5 tapped 3816 TPI and 18 plain
- Precision ground and case hardened on all six sides
- Squareness of all sides is within 0002 per inch
- Used for setup layout and inspection jobs
- Has 23 holes with 5 holes tap to 3816 threads for clamping and 18 untapped holes