Features: Quickly and easily level your optics in the outdoor, at ranges, or at home. Convenient storage and transport. Great for long-range shooting. Provides a precise level. Compatible with 20mm/11mm rail systems. Installs quickly and easily to the rail. Use this bubble level to ensure your rifle is level when aiming at targets. Mounts quickly and easily to the rifle scope tube. Specifications: Materials: Aluminum alloys Clamping Size: 20mm (0.79 inch) / 11mm (0.43 inch) Package Includes: 1 x Scope Bubble Level Note: Please allow 1-2 cm errors due to manual measurement. Please ensure you are comfortable with this before ordering. Due to differences between monitor displays, the picture may not reflect the actual color of the item. Additional Notes: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error. Ensure you are comfortable with this before ordering. 2. Due to lighting in photographs and differences in monitor displays, the images may not reflect the actual color of the item. Please confirm you are comfortable with this before placing your order. About Shipping: 1. Please verify your delivery address details such as name, street, house number, doorbell/email, etc., are correct to ensure proper delivery. 2. All items will be shipped within 3 business days after payment is received. Delivery typically takes 812 days, depending on location and circumstances. 3. If you have any questions during the shopping process, please . We will respond within 347 hours. We hope you enjoy your shopping experience!