Day or Night With Your for Glock TRUGLO Tritium Has Your Back TRUGLO sights are one of the industries best kept secrets. These sight give you all the same features for less than other big name manufactures. The Tritium Pro sights are no exception! The front sight includes a Focus Lock ring that is a bright orange ring around the tritium vial that will help draw your attention resulting in faster sight accusation. The rear sight is solid black but does still house tritium vials to give you the traditional 3 green dot night sights. The construction of these sights will offer years of use with out the worry of them failing. Made from high quality materials and assembled in the Unites States of America guarantee a top notch product. TRUGLO Tritium Pro Night Sights Specifications and Features: Manufacturers Number TG-231G2MC Orange Front Sight Focus Lock Quick and Accurate U-Notch Design Angled Rear Sight for One Handed Manipulation Quality Swiss Tritium for Maximum Brightness Snag Resistant Glows in the Dark Steel Fits: for Glock MOS models of 40/41