Each unit is hand tuned during the manufacturing process Laser module is permanently secured in place insuring reliable performance and durability Includes molded plastic storage case The Wheeler Engineering Professional Laser Bore Sight is constructed of a machined aluminum body with soft rubber over-molding which houses the laser module. It's high-power laser is visible during daylight conditions and a high strength magnetic connection ensures a solid fit to the barrel of nearly all rifles muzzleloaders shotguns and handguns. A magnetic connection to the end of a firearm's muzzle provides more precise alignment with the bore while eliminating the risk of damage which may occur with arbor style bore devices.