QRW Rings (Quick Release Weaver style) means detachable accuracy in a cross-slot format. QRW rings use an adjustable, double-lever mechanism to securely lock the rings onto your Weaver style base. Will fit any existing cross-slot Weaver style bases, or can be teamed up with Leupold QRW bases as shown above. The advantages of these mounts are many; you can remove scopes for travel, use one scope for two or more rifles, use a high magnification scope for bench work and a low power scope for hunting, etc. Ring height is measured from the contact point with the base to the center of the ring. Rings feature Torx® fasteners and include a wrench. Order bases separately. Measured from the top of the base to center of ring.
Big Book Catalog, Issue:70, Page:259
Sinclair, Issue:5B, Page:203