Sight Body Style - Hooded .240 aperture. Crosshair Type - Duplex. Crosshair Size - .010 / .020 Diameter. Crosshair Material - Heat treated. Installation - Replaces mil-spec front sight post sight w/o modifications to the weapon. Does not require a special tool. Using a ball point pin to depress the front sight detent, the installer can simply rotate the hooded sight with the finger tips.