Fowler - Certified Space-Blox - 53-680-050-0
- 36 blocks in set.
- Manufactured to meet Federal Specification ASME B89. 1.9-2002 tolerances on length for inch gage blocks.
- Certificate of Calibration traceable to N.I.S.T.
- Tolerances to 0.00005"
- Ground, hardened and tapped
- 4 connection screws included
- Includes shop hardened fitted case
