For shooters seeking an alternative to the traditional post and notch sight design, there's AMERIGLO Ghost Ring sights. This unique design utilizes an aperture-style rear sight with two tritium mini-dots and a bright tritium front sight, which leads the eye to automatically center itself in the rear ring while focusing on the front sight. The result: immediate front sight acquisition. Front Sight Height: 0.240" Front Sight Width: 0.140" Fits: Glock Gen 5 9mm/.40/Glock MOS.