UP100 Cartridge Red Laser 7mm REM MAG Bore Sighter Boresighter Copper/Brass For Scope Hunting Easy-to-use, self-contained boresighting system fits in the chamber of your rifle or pistol and projects a powerful red laser beam aligned with the bore axis for sighting to the point-of-aim without firing a shot. Works with scopes, holographic red dot sights, and variety sights. Precision accuracy, Material: Brass Maximum output power: &lt;5mw, FDA & Amazon Standards Type: Class IIIa Laser wavelength: 650 nm. ; Operation: On/Off End Cap