Tin Coated 1-2-3 block set
- Titanium nitride coated surface provides extra wear and corrosion resistance
- Presicion ground & heat treated to 55-62 rc
- Parallel ti .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