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.