MEPROLIGHT combat-proven self-illuminated adjustable 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 adjustable 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 adjustable night sights can be mounted directly with minor modifications. Fits Smith and Wesson K/L/N Frames with a pinned front sight Non-DX or Dovetail front sight. Front Sight Length: 0.71″. Front Sight Width: 0.14″. Front Sight Height: 0.38″ Rear Sight Length: 0.23″. Rear Sight Width: 0.61″. Rear Sight Height: 0.36″.