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″.