The HD Night Sights were specifically created to address the needs of tactical shooters. The three dot green tritium night sight set's front sight features a taller blade and an aiming point ringed in photoluminescent paint while the rear sight is outlined in black and features a wider U-shaped notch. This unique configuration increases visibility and quickens front sight acquisition-even in transitional lighting. Additionally, the front surface of the rear sight is steeply hooked to assist in emergency one-handed slide operation. Set Screw not included. Notes:Front Blade Width: 0.144"Front Blade Height: 0.215"Front Overall Height: 0.306"Rear Notch Width: 0.169"Rear Blade Height: 0.325"Rear Overall Height: 0.415"Will not fit Optics Ready models FeaturesIncreased visibility and quick front sight acquisitionWide U-shaped notchRear sight steeply hooked to assist in emergency one-handed slide operation