Machined steel rear sight is fully adjustable for windage and elevation, with each positive click equaling approximately 4/10" movement at 100 yards (varies with sight radius). Adjusts from a height setting of approximately 1.69" to 2.06".Comes complete with three different apertures. This rear sight design is compatible with most popular lever action rifles, but requires the correct mounting screw set for use (sold separately). Gunsmithing may be required.