DIAMETER: 0.393″+/-.0020″
THICKNESS: 0.197″+/-.002″
PARALLELISM: 3 ARC MINUTES MAXIMUM.
FLATNESS: 5 WAVES MAXIMUM @ 0.633um, 2 FACES.
SURFACE FINISH: 20-10 PER MIL-PRF-13830, 2 FACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE
CRYSTALLOGRAPHIC ORIENTATION: (0001)