The Trijicon Bright & Tough Night Sights feature the standard 3-Dot sight picture and can help increase the shooters accuracy when in low-light conditions. These shock resistant sights have a metal body for housing and a silicon rubber cushion. The lamps are contained in an aluminum cylinder and each lamp has a sapphire jewel at the cap for protection and even light distribution. Compatible with S&W models: 5903, 5904, 5906, 915 and 411