The single adjustable rear sight which easily fits the most popular auto pistols without replacement of the factory front sight. By replacing the factory rear sight with a tpu, adjustable in windage and elevation with hardened click screws, you will convert your semi-auto into a modern firearm ready for target and practical shooting. Features: a Works with the factory front sight. a Fits the existing dovetail slot without milling work. a Machined from solid steel using state-of-the-art cnc milling. a Tapered dovetail for a better locking in the slide (install from left to right). a Allen wrench and adjustment screw driver included in the package. Mfg: L.P.A. Sights