Precise Tin Coated 1-2-3 Blocks - TBS-321
- Titanium nitride surface provides extra and corrosion resistance
- Precision ground & heat treated to 55-62 RC
- Parallel to .0003 on all sides; up to .0003 over allowance for nominal lapping
- Has 23 holes -5 holes tapped 3/8-16, 18 drilled through
- Sold in pairs
