Feature: 1. Improve Accuracy: Laser bore sight emits a straight red laser beam, providing an accurate reference for zeroing in on your target. 2. Clear Beam: Clear and bright red laser, which is not easily affected by weather and has a longer sighting range, allows you to accurately aim at the target even in low visibility. 3. High Adaptability: The laser bore sight is equipped with 5 caliber adapters, suitable for firearms with calibers ranging from .22 to .50. 4. Lightweight: Laser bore sight is lightweight and durable. Its compact design makes it convenient for storage and easy to carry. 5. Easy to Use: Simply choose the appropriate caliber adapter and insert the laser bore sight unit into the muzzle for quick and convenient setup. Specification: Item Type: Bore Sight Kit Material: Aluminum alloy Compatibility: Firearms with calibers from .22 to .50 Includes: Matching batteries Battery Type: 3 x 1.5V LR44 Battery Capacity: 160 mAh per battery Length: Approx. 155 mm / 6.1 in Package List: 1 x Red Laser Bore Sight 3 x Button Cell Batteries 1 x Electronic Compartment 5 x Caliber Adapters 1 x Wrench 1 x Screwdriver 6 x Screws 1 x Instruction Manual