With the challenges of law enforcement and military in mind, Trijicon HD Night Sights is a self-luminous three dot sight set which uses a tritium-phosphor lamp protected within an aluminum sleeve and capped with a sapphire jewel to evenly distribute light and protect from solvents and puncture. They have a metal body with a silicone rubber cushion for shock protection. The u-notched rear sight is angled and serrated to reduce glare, while the front sight has a tall blade. The protective clear coat resists powder residue and cleaning solvents to keep the color bright for years. This sight set will fit Glock models: 17, 17L, 19, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33, 34, 35, 37, 38 and 39. It has a green front with a yellow outline.Specifications and Features: This is not a Glock Factory Product, it is an after market Product Manufacturer Number: GL101Y Designed for tactical shooter Increased visibility and quick front sight acquisition Wide U-shaped notch Rear sight steeply hooked to assist in emergency one-handed slide operation