Zev Technologies fiber optic sight sets are an inexpensive addition that a Glock owner can make to their firearm. The top 3 complaints from Glock owners are the trigger, grip, and sights. --Fiber optic sight sets have the highest resolution and greatest ease of acquisition. -- Higher visibility will allow you to keep your sights on target. --The right Zev Technologies; Sight set will improve your shots on target dramatically over a factory Glock sight set. --Notch width of .140 & Notch dept of .145 will allow you enough room to keep your eyes on target during transitions. Zev Technologies; Parts always incorporate design, feel, and performance. Zev Technologies; fiber optic sight sets are machined and assembled from Quality Billet materials and built to last.