Swiss tritium gives the tritium night sight maximum brightness. Without a need for batteries, shooters are never left without a usable sight. Aiding visibility even further is the front sight Focus Lock ring. Reliable and durable, the snag-free design fits standard holsters. Tritium night sights are coated with the Fortress Finish for permanent protection. Angled read sight for emergency one-hand operation Quick and accurate U-notch design Assembled in the USA This tritium night sight is compatible with Glock handguns. Mfg: Truglo