DIAMETER: 1.800″+/-.005″
THICKNESS: 0.125″+/-.005″
PARALLELISM: 20 ARC SECONDS MAXIMUM.
FLATNESS: 3 WAVES/INCH MAXIMUM, 2 FACES.
SURFACE FINISH: 10-5 PER MIL-PRF-13830, 2 FACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE
CRYSTALLOGRAPHIC ORIENTATION: (0001)