Scope Bubble Level for 11mm & 20mm Rails - Horizontal Leveling Tool Features: Quickly and easily level your optics outdoors, at shooting ranges, or at home. Convenient storage and transport, ideal for long-range shooting, perfect leveling. Suitable for 20mm/11mm rails, can be installed quickly and easily. Use this bubble level to ensure your rifles are perfectly level. Mounts quickly and easily to the rifle scope. Specifications: Materials: Aluminum alloys Clamp size: 20mm (0.79in) / 11mm (0.43in) Package includes: 1 piece scope bubble level Note: Please allow 1-2cm error due to manual measurement, make sure you don't mind before ordering. Due to differences between monitors, the image may not reflect the actual color. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3 g weight error. Please make sure you don't mind before ordering. 2. Due to lighting during photography and differences in monitors, the images may not reflect the actual color of the real item. Please make sure you don't mind before ordering. Thank you! About Shipping: 1. Please ensure your shipping address, including name, street, house number, doorbell/email address without a name, etc., is correct. Otherwise, the order will not be delivered correctly. 2. All items will be shipped within 3 business days of receiving payment. In most cases, you will then receive them within 8-12 days. The exact delivery time depends on the circumstances. 3. If you have any questions during the shopping process, please contact us. We will reply within 347 hours. We wish you a pleasant shopping experience!