The HD Night Sights from Trijicon for the Glock 20, 21, 21SF, 29, 30, 36, and 41 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 included.Notes:Front Blade Width: 0.144"Front Blade Height: 0.215"Front Overall Height: 0.268"Rear Notch Width: 0.169"Rear Blade Height: 0.201"Rear Overall Height: 0.291"FeaturesDesigned for tactical shooterIncreased visibility and quick front sight acquisitionWide U-shaped notchRear sight steeply hooked to assist in emergency one-handed slide o...