AMERIGLO Optic Compatible sets provide a precise, elevated co-witness sight picture for slide-mounted red dot optics and serve as reliable back-up sights. Items also available individually. GL-814 2XL Tall Green Tritium Black Outline, Green Tritium Black Outline. Front Sight Width: 0.125" Front Sight Height: 0.350" Rear Sight: 0.429". Fits All Glock Models (Excludes 42, 43, 43X, & 48) and Glock MOS. Compatible with Vortex Viper.