Let's say you measure your own glasses to find that your Temple Tip Diameter is 7mm (0.276 inches) and your Temple Bend Diameter is 5mm (0.197 inches).
From Step 1, the following candidates should be pre-selected:
...since all of these Keepons styles have Fully Stretched Threading Hole Diameter values which are larger than your Temple Tip Diameter of 7mm.
Next we go to Step 2, to find that of those Keepons styles you pre-selected, only:
...have Unstretched Threading Hole Diameters that are less than your Temple Bend Diameter of 5mm. As a result, you can go ahead to choose from them as well-fitting Keepons for your glasses.
Finally, you may find that none of our styles will fit your glasses, in which case please contact us at firstname.lastname@example.org for other suggestions.