HIVIZ front sights are machined from solid steel and feature fiber optic LitePipe inserts for increased visibility and faster sight acquisition in all conditions. Includes interchangeable lite pipes. FeaturesLITEWAVE interchangeable LitePipe designIncludes green, red and white LitepipesAll steel constructionLitePipe diameter 0.090Pinned sights must be fit and drilled for the pin. we recommend installation by a qualified gunsmithFits most Smith & Wesson models with 2.5 inch, or longer, barrels, and adjustable rear sights, excluding Classic Series, and Performance Center guns Notes: Height measurement is from the top of the sight blade to the bottom, not including the tenon portion of the sightGunsmith installation is recommended by HIVIZ. The dovetail portion of the sight is slightly oversized to allow for variance between firearms and fitting will be necessary.