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. 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. Compatible w/Glock 17/17L/19/20/21/22/23/24/25/26/27/28/29/30/31/32/33/34/35/37/38/39/41 except single stack 42, 43, etc and MOS models.