Specification of our Pyramid prism as follow:
*Material BK7 
*Beam Deflection 180 degree +/- 5 sec
*Dimension Tolerances +/-0.1mm
*Clear Aperture >80%
*Surface Quality:60/40
*Surface Flatness λ/4@ 633nm
*Angle Tolerance 60 degree+/-3 minutes
*Chamfer 0.3mm+/-0.1mm
*Coatings Optional