Signature off-set rings
Inspireart: I've been using the Burris Sig. Zee Rings w/ the off-set inserts for a few years now, keeping my erector tube & adjustment "click" range very close to center. The off-set rings must be used in matching pairs. Ex; + .020" and -.020" in the front ring, or +.010" and -.010" in the rear ring. A very clear instruction sheet comes w/ the 3 ring set: " always use inserts in sets (one "+", one "-") of the same value". Although I recently opened a single set of +.020" and -.020" inserts and there was no instruction sheet. If still in doubt, call Burris, (970)356-1670 customer service. They have always been very helpful w/ questions/problems.