Click adjustment design for windage and elevation adjustment. High visibility fiber optics for target and hunting. Improved visibility in low light conditions CNC machined out of high-grade aluminum. For revolvers with spring pin front sight only. Features of WILLIAMS GP-100 Fiber Optic Green Sight 70958 - Front/Rear sight set; - Fiber Optic Sights; - Adjustable Rear Sight; - Fixed Front Sight; - CNC Machined Aluminum; - Matte Black; About Williams: Williams Gun Sight Company was started in 1926 by Harvey Williams as a sight manufacture. The company grew its sight manufacturing business over the years then developed a retail store and shooting ranges in Davison, Michigan. In recent years, Williams is the oldest sight company that provides sights to many different gun manufactures.