Wheeler Professional Laser Bore Sighter. This bore sight is designed by Wheeler Engineering to stay firmly in place with a magnetic connection to your rifle barrel and it's flexible enough to work with shotguns and handguns as well. Each Wheeler Pro Laser Bore Sight is hand-tuned in the factory for precision calibration and superior accuracy. Don't risk damaging the rifling on your firearm with arbor-style bore sights - the Wheeler Professional Bore Sight can get you on paper without a scratch on your barrel thanks to the soft rubber over-molding around the laser unit. An aluminum housing insures that this Wheeler Bore Sight will last for years and perform reliably when you need it Specifications for Wheeler Professional Laser Bore Sighter: Manufacturer: Wheeler Engineering Caliber: Universal Fabric/Material: Aluminum Battery Type: Lithium 123A Condition: New Battery Quantity: 1 Features of Wheeler Professional Laser Bore Sighter: Makes initial scope adjustment simple fast and precise Compatible with a wide variety of guns High power daylight visible green laser Package Contents: Wheeler Professional Laser Bore Sighter Hard case for storage (1) 123A Lithium Battery Wheeler Professional Laser Bore Sighter 589922