adapter ring, the monoculars 16733 and 16734 can be used with the reading caps 16210 - 162116 Viso-quick finger ring (Item No. 16711)The finger ring ensures inconspicuous use and provides stability when

adapter ring, the monoculars 16733 and 16734 can be used with the reading caps 16210 - 162116 Viso-quick finger ring (Item No. 16711)The finger ring ensures inconspicuous use and provides stability when