The bright and ultra-durable HiViz LiteWave sight will enhance your confidence and shooting experience for the Ruger Mk I-IV Pistol. It features an all steel frame and interchangeable LitePipes. Factory height, fits and is compatible with models with factory rear sight. This model is compatible with Ruger Mark I,II,III,IV, Single-Six revolvers with adjustable rear sights and Browning Buck Mark pistols with 0.750" bull barrel only. Does not fit Ruger 22/45 Lite model and Buck Mark 5.50" Target, Buck Mark 5.50" Field & Challenge. Blade Width: 0.125". LitePipe Diameter: 0.090". Litepipe Handgun version #6. Front Sight Length: 1.300". Front Sight Width: 0.350". Front Sight Height: 0.468".Specifications: Type: Front Frame Material: Steel Frame Color: Black Firearm Fit: Ruger MKII/MKIII/Buckmark