Dove tail mounting system with a 6" extension that is made of machined aluminum that features a round housing for peep alignment, level, stainless steel pins with 7.5" of .029" fiber optic material attached. The windage and elevation are separate for precise leveling. It's black, has a built in harmonic damper and 3 rd. axis leveling.Related Info: Also available in .010" & .019" fiber. Threaded to accept a magnified lens.