Improve the performance of your Ruger MK I, II, III and IV with the new adjustable rear sight. Our bright and fully adjustable rear sight will enhance your confidence and shooting experience.Features: Interchangeable LitePipe design Includes green, red and black Litepipes All steel construction LitePipe diameter 0.070 Windage and elevation click adjustment Limited lifetime warranty under normal conditions and proper use of firearm Fits Ruger Mark I, II, III and IV pistols; 22/45 with adjustable rear sight including the 22/45 LITE.