Extension Rings allow you to shorten or lengthen your ring spacing on rifles. A common application is on firearms with long actions, where the normal 4-inch ring spacing is not possible. But whether you are lengthening or shortening the ring spacing, Leupold's extension rings allow you 5/8-inch of adjustment. Manufactures Website Address www.leupold.com Warranty Information Full lifetime guarantee. If any product has defects in materials or workmanship, Leupold will, at their option, repair or replace it free. Even if you are not the original owner.