The Wheeler Engineering Professional Laser Bore Sighter features a high power red laser and innovative magnetic muzzle connection for fast accurate bore sighting across virtually all firearms including rifles shotguns and handguns.Wheeler Engineering Professional Laser Bore Sighter with Red LaserHigh-strength magnetic connection provides precise bore alignment without damageMachined aluminum body with soft rubber over-molding for durabilityHand-tuned calibration mechanism for maximum precisionPermanently secured laser module ensures reliable performanceIncludes molded plastic storage casePowered by single Lithium 123A battery (included)Superior to traditional arbor-style bore devices this professional-grade sighter makes initial scope adjustments simple fast and precise for serious shooters and gunsmiths.