Improve the performance of your Ruger MK I, II, III and IV with the new LITEWAVE(R) sight. Our bright and ultra-durable LITEWAVE(R) sights will enhance your confidence and shooting experience.Features: LITEWAVE(R) interchangeable LitePipe design Includes green, red and white Litepipes All steel construction LitePipe diameter 0.090 Blade width 0.125 X Factory height front sight compatible with factory rear sight Limited lifetime warranty under normal conditions and proper use of firearm Replacement LitePipe Handgun version #6 Fits Ruger Mark I, II, III and IV steel bull barrel pistols; 22/45 with adjustable rear sight (does not fit 22/45 LITE); Single-Six revolvers with adjustable rear sight. Also fits Browning Buck Mark pistols (does not fit Challenge, 5.5 Target, and 5.5 Field).