XS Sight Systems DXT Big Dot Pistol Tritium Night Sight Colt Enhanced Govt. 5in Matte Black Standard. Precision Machined in Fort Worth TX XS Sights Feature a Big Dot Tritium Front Sight and Express Rear Sight With a Vertical Tritium Stripe for Fast Sight Acquisition in All Light Conditions. Big Dot Demands Your Attention - Even in High Stress and for Those With Poor Eyesight Aids in Rapidly Achieving Combat Effective Hits. White Dot Reflects Ambient Light for Best Visibility in Low Light. Shallow V-Notch Rear Provides an Unobstructed View of the Front Sight Along With a Greater Field of View Down Range Especially When Moving and Shooting. Day-Light Half-Light Or Low-Light Just inDot the Iin and Center the Dot Over Your Target Within 15 Yards. Outside Diameter Big Dot 0.188in; Fits in Common Holsters. Installation Requires Filing to Fit Sight to Dovetail Do Not Use a Sight Press/Pusher Tool. Specifications for XS Sight Systems DXT Big Dot Sight - Colt: Manufacturer: XS Sight Systems Gun Make: Colt Gun Model: Colt 1911 Enchanced Government Color: Black Front Sight Color: Green Rear Sight Color: Green Fabric/Material: Steel Gun Type: Pistol Illumination Type: Tritium Additional Features: Big Dot's Outside Diameter is 0.188in Included Accessories: Red Threadlocker Allen Key Mount Type: Dovetail Finish: Blued Package Contents: XS Sight Systems DXT Big Dot Sight - Colt Red Threadlocker & Allen Key XS Sight Systems NE-0007S-5: DXT Big Dot Pistol Tritium Night Sight Colt Enhanced Govt. 5in Matte Black Standard