Rollo 1911 Kensight Rear Sight Trijicon Tritium insert - Night Sights Anti-Snag Blade The Rollo - Tritium just like the standard Rollo, is a no-nonsense adjustable sight, patterned after the style that was popular for years at Camp Perry. Same range of windage and elevation adjustments as our BMCS sights, but easier to carry. Can be mounted on the 1911 slide in the old National Match style that was popular in the early 1960s or, for carry use, mounted slightly forward of the rear edge of the slide using the Caspian Arms Rollo cut. Available in Trijicon 0.062 green or yellow dot tritium. Specification: 4140 chrome-moly steel Sight Body Dimensions: 1.335" x 0.689" x 0.43" Blade Notch Dimensions: 0.119" x 0.08"International shipping not available on this product. IMPORTANT INSTALLATION NOTES: Please be sure you are purchasing the correct sight for your existing slide dovetail. If you are unsure of your factory dovetail dimensions, call the manufacture or do some research to be sure this is the correct sight for your dovetail cut. There are a lot of Forums around the internet that will be able to help with this information as well. THE SIGHT WILL NOT JUST "SLIDE IN" TO EXISTING DOVETAILS. DO NOT FILE ON YOUR SLIDE! Kensight sight dovetails are slightly oversized to provide a factory fit. The actual sight dovetails are larger than your existing slide cut, and this is intentional. Each manufacture has slightly different tolerances on the slide dovetail dimensions. The Kensight sight oversized dovetail will need to be filed and fitted to your particular slide dovetail size. We recommend installation from a competent Gunsmith.