Product Description The Ruff&';s Precision CLR-30100 Co-Linear Bubble Scope Rings are purpose-built for precision rifle shooters who demand the highest level of accuracy from their optics setup. Designed for 30mm diameter riflescopes at a medium (1") mounting height, these rings feature an integrated co-linear bubble level that remains clearly visible from the prone shooting position using the non-dominant eye. The built-in level eliminates the need for separate leveling tools during scope installation, providing a reliable cant reference both in the field and on the bench. Machined from 6061-T6 aluminum with 303 stainless steel cross bolt hardware and an alignment lug for precise cap-to-base registration, these rings are proudly manufactured in the USA. Product Highlights Integrated co-linear bubble level is visible from the shooting position using the non-dominant eye, offering a quick and accurate cant reference before each shot 6061-T6 aluminum ring body and cap deliver a lightweight yet rugged construction built for demanding field use 303 stainless steel 1/2" cross bolt and nut provide outstanding corrosion resistance and long-term hardware integrity Alignment lug ensures precise cap-to-base alignment during cap screw installation, simplifying the scope mounting process Proudly made in the USA with recommended torque values of 18in/lbs for cap screws and 45in/lbs for the cross bolt Specs Brand: Ruff&';s Precision MPN: CLR-30100 UPC: 850063702010 Ring Size: 30mm Height: Medium (1") Weight: 4.4oz Material: 6061-T6 Aluminum, 303 Stainless Steel Cross Bolt Torque: 45in/lbs Cap Screw Torque: 18in/lbs Country of Manufacture: USA Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.