Tikka S1300964 Opti-Lock Rings Black 30mm MediumOPTILOCK 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 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