Costa Ludus sights include a proprietary Night Fision Perfect Dot in the front sight and a horizontal tritium bar in the rear sight, for a unique and unmistakable sight picture. Serrated for low-glare, their shorter height stays well out of the way of your dot for a minimal co-witness. Our patented injection molded sleeve design holds our tritium vials securely in place using ballistic materials. Night Fision night sights carry more tritium than the average night sight on the market and a domed lens engineered to create the a crisp, defined glow. They are recommended for use with a Holosun c-series or Trijicon RMR Type 2 mini-red dot optic. It is highly recommended you compare the blade height with your optic housing height to ensure where they fall in your window. Front Sight Width: 0.140". Front Sight Height: 0.299". Rear Sight Height: 0.330". Fits: Glock 17/17L/19/22/23/274/23/26/27/28/31/32/33/34/35/37/38/39/45/48/MOS; 17/19/22/23/34/35/40/41/45/48.