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 3" Officer & 4.25" Commander .45 ACP. *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".