Bright & Tough Night Sights - Glock Standard FramesInstantly visible sight picture in no light or low light Increased daylight dot visibility Enhanced protection from heavy recoil and harsh cleaning solvents Evenly distributed light from tritium lamps Trijicon Bright & Tough Night Sights are three dot iron sights that increase night fire shooting accuracy by as much as five times over conventional sights. Equally impressive, they do so with the same speed as instinctive shooting and without the need