Maintain your accuracy even in low-light conditions using the Truglo TG13GL1A TFX 3-Dot Pistol Sights, which use a combination of Swiss tritium and fiber optics for a high level of brightness without batteries. These sights have a Focus Lock ring at the front sight for easy target acquisition and are made of CNC-machined steel. Hermetically sealed for added protection. Designed to fit GLOCK 17, 19, 22, 23, 24, 26, 27, 33, 34, 35, 38 and 39 pistols.