"Specification of our beamsplitters as follow:
Material BK7 glass or UV grade fused silica
Dimension Tolerances: +/-0.1mm
Angle Tolerance +/-3’or 30”
Clear Aperture:90% Dimension
Surface Quality:60/40 or 20/10
Surface Flatness:lambda/8 or lambda/4 at 633nm
Chamfer 0.3+/-0.1mm
Coating Optional "