Optical material: BK7 optical glass
The angle between the two long side is 20 degrees.
The two Long sides are polished with a length of 68mm and 64mm
and a width of 36mm. The Short side is 24mm long by 36mm wide.
Wedge prisms are used to change the beam direction.
60/40 scratch/dig quality
Surface Flatness: λ/8