Kensight Springfield Contoured Base Rounded Blade Tritium Rear Sight Black 971-253. The rounded corners on the blade and beveled edges on the base drastically Reduce the chance of an unwanted or more so untimely snag. Its serrated blade contains 2 Green or yellow Trijicon tritium lamps that make it perfect for night time defense. White outlines around the tritium gives extra visibility during the day. We recommend a front sight height of 0.200 Tall at minimum on a standard 1911 slide. This rear sight comes paired with our Springfield tritium contoured front sight with a serrated blade. For this front sight blade heights from 0.150'' to 0.220'' are available upon request. Compatible with Novak type front sight dovetail cuts (0.340" x 60 x 0.075") as typically found on both customized and factory 1911 pistols. Specifications for Kensight Springfield Contoured Base Rounded Blade Tritium Rear Sight: Manufacturer: Kensight Gun Make: 1911 Platform Gun Model: 1911 Color: Black Fabric/Material: 4140 Chrome Moly Steel Gun Type: Pistol Illumination Type: Tritium Package Contents: Kensight Springfield Contoured Base Rounded Blade Tritium Rear Sight Kensight 971-253: Springfield Contoured Base Rounded Blade Tritium Rear Sight Black