When you use Burris Aluminum XTR Xtreme Tactical Double Rings you get the maximum amount of strength while maintaining a lightweight frame. The build is wide with six screws to allow for the highest amount of stability. The cross section is very thick aluminum providing the best return-to-zero mounting system. This ultra-strong system is designed with Picatinny-style rails in mind. The rings are available in several sizes from _-inch to 1-inch thick. These are tactical rings and ready for your heaviest scopes toughest recoils and hard use.