Glowing bright both day and night TFX sights are always ready. TFX takes our award-winning Tritium Fiber-Optic technology even further with all the features our customers requested: compact snag-free design longer sight radius and amazingly durable construction built to handle just about anything. Illuminating elements are encased inside a virtually indestructible chemical and shock-resistant capsule and the CNC-machined steel is protected with a rust-resistant Fortress Finish. Assembled in USA with quality Swiss tritium for maximum brightness. Front sight FOCUSLOCK for fast and accurate shooting. Fits standard holsters. This model fits 1911 5″ Government .45 ACP Ruger SR1911 models with fixed rear sight *Reference to Novak LoMount is for compatibility use only. This product is not endorsed by or affiliated with Novak Designs Inc. Fiber Diameter: 0.074″. Front Sight Length: 1.0″. Front Sight Width: 1.0″. Front Sight Height: 1.0″ Rear Sight Length: 1.0″. Rear Sight Width: 1.0″ Rear Sight Height: 1.0″.