Features: Suitable for adjusting rings with a diameter of 44mm, precise fitting and easy installation. The adjustment rings can accurately fix the aiming scope, ensuring stability during shootings and improving the accuracy of aiming. Suitable for various sight bases and rails systems, it can be quickly installed. Make from aluminum alloy, light weight and with excellent corrosions resistance, can maintain stable performances in humid and variable weather conditions. Specially designed for hunting activities, it can firmly fix sights and improve shootings accuracy, making it great for outdoor hunting enthusiasts. Specifications: Component: Aluminum alloy Dimension: about 44mm/1.73inch Package Includes: 1pc Pipe Diameter Adjustment Rings 1Pc Wrench note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.