These TRUGLO® Tritium Pro night sights were designed to fit the Ruger LC9®, LC9s® and LC380®. The sights utilize Swiss tritium for maximum brightness and provide enhanced visibility in low-light shooting conditions or complete darkness. The sights glow in the dark - no batteries or light exposure is required. The front sight FOCUSoLOCK ring and quick and accurate U-notch design makes it possible to quickly focus on the target. The angled rear sight edge supports emergency, one-hand slide racking while the snag resistant design fits standard holsters. Sights are machined from solid steel and finished with TRUGLO's FORTRESS FINISH™ for a permanent protective coating for maximum protection. Recommend professional installation or use of a quality gun sight tool for installation and adjustment (not included). Assembled in USA.