Maintain your accuracy even in low-light conditions using the Truglo TG13GL3A 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 42 and 43 pistols.