Stopper Pair Mounts (30mm Dia)These pair mounts from Cynosure are made from the finest quality hard steel with steel Allen screws for longer life. Each mount has four top screws to firmly hold the scope and anti slip soft strips are pasted on the inner side of the mount to prevent scratching of the scope. Stopper pair mounts are best suitable for airguns and firearms of medium power. These can easily withstand the recoil pressure from the weapon with the help of the stopping screw