This set of Zeiss Victory Mounting Rings was designed for their riflescopes with a 34 mm center tube construction. The construction of these rings is unique, in that the assembly is vertical and not horizontal. These rings feature Zeiss fine mechanic tooling and will hold zero under the duress of repeated high caliber rifle recoil. The design is not totally permanent, but does not lend itself to quickly swapping out your scope. These rings are best suited for someone who wants a very stable mounting system for one scope on one rifle.