The most complete, accurate, easy and inexpensive way to accurately bore sight your weapon.By installing a laser diode into a (.223 rem.For rifle and 9mm, 30 cal.For pistol) and utilizing an assortment of arbors (except 9mm-- no arbor required), it is possible to bore sight virtually any caliber weapon.Type: Laser BoresighterCaliber: 9mmStyle: CartridgeMaterial: BrassQuantity: 1Battery: LR41Mount: Chamber