Swarovski 42mm 50mm and 56mm tripod adapter allows you to attach 42mm 50mm and 56mm swarovski binoculars to any tripod head with a 14 20 threaded screw the base of this swarovski tripod adapter has a 38 16 threaded hole with a video pin supplied 14 20 reducer bushing and allows the binoculars full interpupillary adjustment range to be retained