Corner cube reflector for golf rangefinder

Corner Cube Retroreflector prism

1.Materials:BK7,N-BK7,UV Fused Silica
2.Diameter Tolerance:+0.00,-0.10mm
3.Clear aperture:>80%
4.Surface Quality:40/20 S/D

 

The typical size of Corner retroreflectors Corner Cube Prisms is 12.7mm (1/2"). 
Whatever direction laser or light entering into the top surface, the incident ray will be reflected on one of the roof surfaces. 
Most specially, the reflected beam out through the top surface will be parallel to the incidence.