Mounted glass achromatic binocular objectives fully AR coated. These have a retaining ring to hold them but have also been glued in. If you want to remove them from the mounting you may have to use a solvent. 80mm clear diameter with a focal length of 350mm. Outside diameter of the mounting (objective side) is 96mm, rear diameter is 37mm and threaded. The entire housing is 230mm long. This make a superb finder scope! Or get one of our binocular porro prism assemblies to make a great spotting scope. Unused.