Laser Calibrator Aluminum Alloy Calibrator Turn-Free Laser Calibrator 8-Hole Adjustable Adapter for 0.177 to 0.50 Caliber This laer calibrator is made of high-grade aluminum alloy material, lightweight, high strength, corrosion resistance, and with long service time. Highly accurate and adjustment-free design, the calibrator utilizes infrared light, with a tube straight in for a more convenient and precise adjustment. 8-hole adjustable adapter, suitable for 0.177 to 0.50 caliber. Features: Made of high-grade aluminum alloy material, lightweight, high strength, corrosion resistance, and with long service time. Infrared calibrator, laser light has a long-distance, bright, and clear light, which better helps calibration adjustment. Highly accurate and adjustment-free design, the calibrator utilizes infrared light, with a tube straight in for a more convenient and precise adjustment. The battery compartment design is simple and beautiful, the tail part can be opened by unscrewing, convenient and practical. 8-hole adjustable adapter, suitable for 0.177 to 0.50 caliber. Specifications: Name: Laser Calibrator  Material: aluminum alloy  Color: red, green (optional) Battery: 1 * CR2 battery (included) Power: <5MW Diameter: 4.2mm Item size: 166 * 18 * 18mm / 6.54 * 0.71 * 0.71in Item weight: 60g / 2.12ounce Package size: 195 * 104 * 30mm / 7.80 * 4.09 * 1.18in Package weight: 131g / 4.62ounce Packing List: 1 * Laser Calibrator  1 * Screwdriver 8 * Adjustable Adapter 2 * Screw 1 * Wrench