Two piece double screw scope mounts. . Suits all Weaver / Picatinny rails. Includes square section high tensile arrestor bolt. 1 inch medium scope ring Fits lens diameters up to 50mm Sportsmatch UK mounts are designed for .22 rimfire and air rifles. Sportsmatch are Britains most popular mounts. Made from premium quality aluminium, all mounts come with Allen keys and Cap Head screws for easy and secure installation.