Lyman's Laser Boresighters are the most convenient and accurate way to sight in your rifles. Our caliber specific boresighters are designed to help shooters sight in, check their zero or practice aiming. Shaped just like a cartridge, the boresighter is simply turned on and chambered in your rifle. The bright laser beam will show you where to move your crosshairs to get you on target without ever firing a shot! Save time, money and ammo! Perfect for when you are installing that new scope. Features: Red Laser wavelength 635-655nm Max output Batteries included 15-100 yard sighting range Brass construction Class IIIA laser Ideal for accurate bore sighting