Glowing bright both day and night TFX Pro sights are always ready. TFX Pro 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. Front sight FOCUSLOCK for fast and accurate shooting. Assembled in USA with quality Swiss tritium for maximum brightness. Fits standard holsters. This model fits 1911 3″ Officer & 4.25″ 9mm. *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″.