The xs dxw big dot night sight is a superior defensive sight set.It features a big dot tritium front sight and express rear sight with a white stripe for fast sight acquisition in all light conditions.Big dot demands your attention - even in high stress and for those with poor eyesight, aids in rapidly achieving combat effective hits.White dot reflects ambient light for best visibility in low light.Shallow v-notch rear provides an unobstructed view of the front sight, along with a greater field of view down range, especially when moving and shooting.Day-light, half-light, or low-light, just "dot the i" and center the dot over your target within 15 yards.Outside diameter big dot 0.188"; fits in common holsters.Rear Color: Black with White StripeType: Front/Rear SetFrame Material: SteelFrame Color: BlackFirearm Fit: S&W M&PStyle: Night Sight SetFront Material: TritiumFront Color: Green with White OutlineFirearm Type: Handgun