The Vortex Precision Matched Rings position the center of the riflescope tube at a height of 1.10 inch from the base. They will only work with Picatinny spec mounts and are not compatible with Weaver mounts. These rings are kept in pairs throughout the manufacturing process ensuring perfection from one set to another. The finishing touch for your rifle and optic combination, Pro Riflescope Rings combine rock-solid reliability and strength with high-quality machining to ensure accuracy and consistency. Streamlined, lightweight, and durable, these rings use four T-25 Torx-style socket cap screws for secure mounting.