TKO Flat & Finished Lightened Differential Ring Set
- The faces are flat to within 2 microns and are parallel to within 1 micron with a #7 finish,
- One micron is 40 millionths of an inch.(.0000040)
- After processing, the rings are checked with an optical flat and monochromatic light. The ultimate measurement for flatness.
Includes two diff rings