Right angel prism:

Main Materail: H-K9 or H-BAK7

Dimension Tolerance: +/-0.03~0.1

90°Angle Tolerance: 10''~5'

45°Angle Tolerance: 3'~5'

Parallelism: 5'~10'

Surface Quality: 60/40~40/20

Flatness: N=0.5~2  ∧N=0.2~0.5

Right angle prism