Kensight DAS 1911 Defense Adjustable Rear Sight with Serrated Blade Snag-Free Combat Style Sight Body Allows One Handed Operation of Slide Sight Body is wire-EDM machined from a Solid Billet of Chrome-Moly steel Fits 1911 Novak LoMount rear sight dovetail cut Fine serrations for superior sight picture in all conditions Backed by our Kensight Limited Lifetime Warranty