Features: Quickly and easily level your optics in the outdoor, at ranges, or at home.<br> Convenient storage and transport, Great for long ranges shootings, perfect level.<br> Suitable for 20mm/11mm leads rail, can installed quickly and easily for rail.<br> Use this bubble level to make surely your rifles level shootings the targets.<br> Mounts quickly and easily to the rifles scope tube.<br> Specifications: Materials: Aluminum alloys<br> Clamping Size: 20mm(0.79inch)/11mm(0.43inch)<br> Package Includes: 1pc Scope Bubble Level<br> 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.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store