Save ammunition and time when sighting your rifles or shotguns thanks to this laser boresighter. The performance of this safe and easy to use tool greatly exceeds the naked eye when it comes to boresighting your weapon. Simply choose the caliber adapter and place the laser unit in the muzzle. The sight will emit a straight red laser beam with a long sighting range. This provides a precise spot allowing you to zero-in on your target. Unlike most in-muzzle boresighters, this unit protrudes obviously from the firearm to prevent accidents. It fits 0.22 to 0.50 caliber rifles, handguns and scopes. It allows for quick and accurate resetting of any sight type (iron, optical, laser, holographic, etc.). Finally this boresight is windage and elevation adjustable, making it extremely precise. It comes with 4 adapters, extra batteries (6 in total), and other tools you will need to make adjustments. Package Includes: 1 x Laser bore-sighter 1 x Screwdriver 1 x Spare screw 1 x Allen wrench 4 x Adapter tips 1 x Padded storage box 6 x AG13 batteries (3 spares) Specifications: Max. Output Power: < 5mW Weight: 1.34 oz / 38 g Material: Aluminum Length: 6.1" / 155 mm Length of rod that fits into the barrel: 2.4"- 3.5" / 60 mm - 90 mm (tapered) Head Diameter: 16 mm Tail Diameter: 5 mm Laser Wavelength: 635 - 655 nm Laser Color: Red Power: 3 AG13 batteries(★ Power: under 5mW, Non-handheld Class 3R lasers ★)