GOHIKING Outdoor Hunting Adjustable Optics Red Dot Laser Sight Scope w/ 20mm Mounts (A-Black) Advantage:Made of best aluminium alloy,tube diameter: 1'' Laser Wavelength: 532nmWeight:410g Two mounts: Picatinny-Weaver Rail Mount & Shotgun Barrel Clamp Mount. The barrel clamp mount fits 1 inch diameter 12 Gauge shotgun Adjustable for windage and elevationProvide clear pionting dot even in day light and clear laser beam in the dark or low light Advanced laser optics give a superb laser sightEmits a highly visible intense red laser beam constantly Package includeRed Laser sight 1,Metal 22mm Picatinny Rail Mount & Rifle 1" Barrel Clamp Mount,Switch button Pressure Pad Switch and "8"type mount, Allen Wrench , 3V CR123A Lithium Battery