This Meprolight night sight set features a green tritium front sight and orange rear sight, and is designed to work in conjunction with a Suppressor. The green and orange tritium used in these sights is superb for daylight, nighttime, and low light conditions. These sights can be used with 9mm, .357 Sig, .40 S&W, and .45 gap.Features:- designed to be used with suppressors- improved target acquisition in low light- performs in all lighting conditions- no batteries needed specifications: - fits: Glock 9mm, .357 Sig, .40 S&W, and .45 gap- front sight/rear sight: green/orange".