This is a genuine Glock OEM steel fixed night sight set, including a tritium front and rear sight for a three-dot low-light sight picture. The steel sight bodies are more durable than polymer factory sights. Features: Genuine Glock OEM factory part Fixed front and rear night sight set Tritium illumination for a three-dot low-light picture Steel sight bodies for added durability Glock fixed sight fitment varies by model and sight height. Confirm that Glock part 39930 is correct for your specific Glock model before ordering. GLOCK is a registered trademark of GLOCK Inc. 3CR Tactical is not affiliated with, endorsed by, or sponsored by GLOCK Inc. Any reference to GLOCK products is for identification and compatibility purposes only.