Kensight Adjustable Target Square Serrated Blade Pistol Sight Set Ruger MKII/MKIII/MKIV 1911 Rear Black. 22 auto. Very distinctive clicks for both elevation and windage adjustments. Made with the same attention to detail as1911 sights. Large Square blade with fine serrations give a superior sight picture over the factory adjustable sight. This rear sight does require a taller front than the factory sight. Authentic Kensight Sights - The Professional's Choice This is an authentic Kensight sight and not to be confused with other brands. When it comes to durability and features the Kensight sights far exceedcompetitors.sights are Wire-EDM machined from a single billet of 4140 chrome-moly steel. The result is a precision sight built with better materials and the Wire-EDM construction ensures the tightest tolerances possible. This translates to ultra-smooth adjustments audible clicks for both windage and elevation and consistent dovetail dimensions in which the ''industry standard'' CNC construction cannot compete. Backed by Limited Lifetime Warranty Kensight 1911 sights are premium quality and the first choice for factory-fit OEM manufactures competition shooters and professional's worldwide. Specifications for Kensight Adjustable Target Square Serrated Blade Pistol Sight Set: Manufacturer: Kensight Gun Make: 1911 Platform Gun Model: Ruger Mark IV Ruger Mark III Ruger Mark II Color: Black Rear Sight Color: Black Sight Style: Square-Notch Fabric/Material: 4140 Chrome Moly Steel Package Contents: Kensight Adjustable Target Square Serrated Blade Pistol Sight Set Kensight 860902: Adjustable Target Square Serrated Blade Pistol Sight Set Ruger MKII/MKIII/MKIV 1911 Rear Black