This laser calibrator is made of high-grade aluminum alloy material, lightweight, high strength, corrosion resistant, and designed for long service life. Featuring a highly accurate, adjustment-free design, the calibrator uses infrared light with a straight tube for convenient and precise alignment. Includes an 8-hole adjustable adapter, compatible with calibers from 0.177 to 0.50. Features: - Constructed from high-grade aluminum alloy for durability, lightweight performance, and corrosion resistance - Infrared laser provides bright, clear, and visible light over long distances to assist in accurate calibration - Precision-engineered straight-tube design enables easy and accurate bore alignment without adjustments - Simple and sleek battery compartment; tail cap unscrews easily for quick battery access - 8-hole adjustable adapter fits calibers ranging from 0.177 to 0.50 Specifications: - Name: Laser Calibrator - Material: Aluminum alloy - Color: Red, Green (optional) - Battery: 1 x CR2 battery (included) - Power: Infrared laser