Specification:
Material : BK7 glass.
Dimension Tolerance: +0.0, -0.2mm
Clear Aperture : >80%
Angle Tolerance:2'
Flatness:?/2 @632.8 nm
Surface Quality: 60-40 scratch and dig
Bevel: 0.2 mm to 0.5mm
"Coating: High transmission ARcoating on two right-angle side, T > 99.5% @ 1064nm,  HR-coating on  hypotenuse   reflection side, R > 99 % @1064nm,
"