These 34MM extra high rings are designed for Large scopes. Constructed of high strength steel with a Nitrite finish. 1/2" hex nut on a 5/8" wide base.  The ring caps are secured in place with (4) #8-40 torx drive screws.  Rings fits on Picatinny style rails. Designed to withstand heavy recoil.  Height from the bottom of the scope to the top of the rail is 1.04" and from centerline of scope to the top of the base is 1.700".