This Rifle Scope Bubble Level is designed for 1-inch/30mm tube riflescopes, helping to prevent canting and improve shooting accuracy during hunting or target practice. Its black color ensures a sleek and subtle appearance on your firearm. The objective lens diameter is 1 inch, and the eye relief is 3 inches, providing a comfortable viewing experience. This riflescope sight does not have night vision capabilities. Create a more stable and precise shooting environment with this Rifle Scope Bubble Level.