AimPoint 12417 Micro T-1 2 MOA with Standard Mount Waterproof to 80 feet Windage and elevation adjustable ; Clear aperture: 20 millimeter (.78 inch) 13 brightness settings. Ideal for rifles, carbines, shotguns, submachine guns, and handguns 4 night vision compatible settings and 8 daylight settings. one extra bright for use with laser protection glasses or in bright desert sunlight Precision adjustments for windage and elevation: top of protective caps fits into holes on adjustment screws.no other tool required