Night fision night sights carry more tritium than the average night sight on the market and a domed lens engineered to create the a crisp, defined glow.The domed lens collimates tritium rays for a sharper sight picture.Cnc machined out of high quality steel.Black nitride coating used to improve wear and corrosion resistance.Gunsmith recommended for installation.Built in the usa with swiss tritium.Front sight width: 0.140".Front sight height: 0.230".Rear sight height: 0.330".Rear Color: Green/Tritium Black RingType: Front/Rear SetFrame Material: SteelFrame Color: BlackFirearm Fit: S&W M&PStyle: SquareFront Material: TritiumRear Material: TritiumFront Color: Green/Tritium Fluorescent Yellow RingWindage Adjustment: NoElevation Adjustment: NoFirearm Type: Handgun