This is a Glock branded Tritium front night sight that will fit on all Glock pistols except sub-compact Glocks. The tritium vial integrated into this sight is self-luminous and will provide you with a green glowing sight reference to give you a better sight picture in low light situations.
This sight does include a hex screw for mounting it to your Glock. Due to the Glock design the front sight is very simple to install. All that is require is a Glock Front Sight tool and some thread locker for installation. The front is set in a fixed position.
Glocks use a standard height front sight. To change the elevation of your point of aim, you would alter the height of your rear sight.