Corner Cube Retroreflector is always used to reflect the beam entering the prism face, regardless of its orientation to the beam. Corner cubes are widely used where precision alignment is difficult.
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