Konus' Steel Ring Set is constructed of a high quality steel and are ideal for mounting your riflescope. They are suitable for Weaver/Picatinny rails. This model has a 30mm diameter and a medium mount height.A complete assortment of high quality steel mounting rings for riflescopes. These rings are suitable for weaver/picatinny rail. Features: Durable steel construction Heavy-duty Torx screws Square recoil lug Matte black surface treatment