MEPROLIGHT combat-proven self-illuminated night sights enable you to upgrade your capabilities to hit stationary or moving targets under low-light conditions with dramatically increased hit probability. TRU-DOT models offer a handgun sighting system for improved rapid instinctive aiming which requires no transition from day to night use. Day and night, the shooters aiming reference is three solid dots, identical in appearance and location under all light conditions. Designed as replacement parts for the standard weapon sights, Meprolights Self-Illuminated night sights can be mounted directly with minor modifications. Meprolight is responding to users needs, our TRU-DOT models are available in various tritium dots color on the rear sight : Green, Yellow, Orange (Yellow or Orange for selected models only) and green tritium dot on the front sight. Model fits Walther P99/PPQ & M2- Non- Optics Ready- Windage Screw Version. Front Sight Length: 0.51″. Front Sight Width: 0.14″. Front Sight Height: 0.26″. Rear Sight Length: 0.39″. Front Sight Width: 0.67″. Front Sight Height: 0.33″.