Tikka Optilock ring mounts are precisely machined out of solid steel to ensure perfect mating with our integral receiver tapered scope mount rails and optimal scope alignment. Optilock ring mounts come packed in pairs all tools for assembly included in the box. Mount rings feature a patented spherical fastening ring which makes scope mounting considerably easier. This protective sleeve also ensures that the scope body will not be scratched or damaged during mounting.Optilock scope mount rings and bases are precisely machined out of solid steel to ensure perfect mating with our integral receiver scope mount rails and optimal scope alignment. OPTILOCK scope mount rings come clamshell-packed in pairs. Hex key included. Optilock scope mount rings are available in two diameters and three heights and fit both Sako and Tikka rifles. Low and medium rings are also available in stainless steel. Optilock scope mount rings feature a patented spherical fastening ring which makes scope mounting considerably easier. This protective sleeve also ensures that the scope body will not be scratched or damaged during mounting. Appropriate ring height can be determined with the help of the following chart. The maximum scope objective lens diameter (or diameter of scope-lens cover) that can be used with the scope mount in indicated in the column scope outer maximum diameter. The larger value can be used with standard-contour barrels, while the smaller number should be used with heavy-barrelled models (such as varmint rifles).