I needed a pair of tall rings in order to mount a 30mm tube, 56mm obj. scope on a Ruger M77. These were the only ones available that were tall enough for my particlur rifle. Just as well though, they are my second favorite brand of rings. (The Burris "Pos-A-Lign" rings being my first choice. The Burris are not available for this rifle in this size though.)
The Leupolds install easily, don't slip and are made of high quality metal. I've tried others but keep coming back to these and the Burris.
Pros: High quality.
Cons: High price.
This review was written in the old system and had content requirements that are different than reviews written today.