Feature:1. Improve Accuracy: Laser bore sight emit a straight red laser beam, providing a 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 sighting longer rang, allows you to accurately aim at the target even in low visibility.3. High Adaptability: The laser calibrator is equipped with 5 caliber adapters, suitable for any drill bit and viewfinder with diameters ranging from 0.22 to 0.50.4. Light Weight: Laser calibrator is lightweight and durable. The compact design for convenient to storage and easy to carry.5. Easy to Use: Simply choose the caliber adapter and place the laser bore sight unit in the muzzle, which is convenient for your use.Specification:Item Type: Bore Sight KitMaterial: Aluminium alloyUse: For any drill and viewfinder from 0.22 to 0.50 caliberShipped with matching batteryBattery Properties: 3 x 1.5V LR44Single Battery Capacity: 160mAhLength: Approx.155mm / 6.1in.Package List:1 x Red Laser Bore Sight3 x Button Cells1 x Electronic Compartment5 x Adapters1 x Wrench1 x Screwdriver6 x Screws1 x Instruction Manual