Leupold Mark 4 30mm High Mount Scope Aluminum Rings, Matte Finish - 57291 Product Description:Mark 4 tactical bases and rings are the strongest of all Leupold mounting systems. The one-piece base features a built-in 15 MOA slope for long range shooting. Both 6-48 shoulder screws and the larger 8-40 screws are included to accommodate high recoil applications. Strong 1/2" keeper nuts lock the rings solidly against the one or two-piece bases, or any Picatinny-style rail.In the field, you count every ounce of weight, because you’ve got to carry it. Mark 4 Aluminum mounts are machined from a single piece of aircraft-grade aluminum, so they’re incredibly strong, yet lightweight.Specifications and FeaturesMark 4 rings30mm RingHigh height 1.06"Matte finish