The DD119X "Battle Flag" red dot is constructed of aircraft grade aluminum and has an ergonomic design which saves space on your rail for other accessories. Equipped with a locking set screw to stabilize your sighting adjustments (use only if needed and turn 1-2 times clockwise only) APERTURE：33mm LENGTH：82mm WEIGHT： 291g FIELD OF VIEW： 15.8m@100m RAIL：1913 Mil-Spec The DD119X includes: 1x Type Red Dot & Green Dot Sight, 6x AG3 Batteries- 1x Instruction Manual- 2x Allen Wrench- 1x Lens Cleaning Cloth The DD119X red dot comes in a black finish with the reverse "Battle Flag" proudly worn by military and law enforcement.