Rugged metal construction for the professional user Works with 1.5" and 1.93" optic heights Suitable for primary or backup role Tritium enhanced front sight for lowlight / nighttime operations 12 Year Warranty for tritium illumination The all-metal FABS are tritium-enhanced, self-illuminated front and rear Folding- Adjustable -Back-up - Sights flip into place in case the primary optics go down. Designed for military and LE shooters running a taller optic. Material Metal Illumination Green Swiss Tritium on front sight, Blank Rear sight Available Body Colors Black Click size a Windage: Each click will move the bullet 1 MOA. a Elevation: Each click will move the bullet 1 MOA. *Note: Dependent on weapon type. The distance between sights is 40cm