Feature: 1. Improve Accuracy: The laser bore sight emits a straight red laser beam, providing an accurate reference for zeroing in on your target. 2. Clear Beam: The clear and bright red laser is not easily affected by weather conditions and offers extended sighting range, allowing you to accurately aim at the target even in low visibility. 3. High Adaptability: The laser calibrator comes with 5 caliber adapters, suitable for firearms with bore diameters ranging from 0.22 to 0.50 caliber. 4. Lightweight Design: The laser calibrator is lightweight and durable, with a compact design for easy storage and portability. 5. Easy to Use: Simply select the appropriate caliber adapter and insert the laser bore sight into the muzzle for quick and convenient setup. Specification: Item Type: Bore Sight Kit Material: Aluminum alloy Use: For firearms with calibers from 0.22 to 0.50 Battery: 3 x 1.5V LR44 (included) Single Battery Capacity: 160mAh Length: Approx. 155mm / 6.1in Package List: 1 x Red Laser Bore Sight 3 x Button Cells 1 x Electronic Compartment 5 x Adapters 1 x Wrench 1 x Screwdriver 6 x Screws 1 x Instruction Manual