The Warne Scope Rings sport the unique Warne indexable lever system which allows the user to remove the rifle scope optics from the rifle then reattach it without the loss of zero, as well as allowing the location of the lever to be indexed once the Mounting Rings are affixed to the Tactical Scope Mounting Bases. After the levers are tightened, simply pull out on the lever, turn it to the desired location then let it snap into place. When used on the all steel Warne Mounting Bases, we guarantee accuracy of within 1/1000th of an inch when removing and reattaching the optics.