SVL engineers have developed a light collection lens system that loads ambient light directly intot he end of the fiber optic. The collection lens system is the only technology available that will take natural ambient light, not only directing it to the fiber end, but intensifying the natural light in the process. Features 2nd & 3rd axis bracket mount, five sight pins made from liquid metal that eliminates pin breakage. Pin size .029 in green, yellow and orange and one single-plane adjustment pin, size .019 in green.