High quality lens for increased sharpness and clarity 10X/20X/30X magnifiers with 21mm lens diameter, specially designed for inspecting those small objects Perfect for the watch industry, gemstone and diamond inspection; Good for jewelry, coins, stamps and antiques etc. Foldable and tiny, comes with its own hard plastic felt lined storage case, easy to store, protects the magnifying magnifier Folding stainless steel housing, chrome alloy frame protects the lens; The eyelet allows the magnifier to be attached to a chain or twine Note: The data is manual measurement, please allow 1-3cm error, due to differences between light and display, there will be a certain color difference, the specific received in kind shall prevail. Note : the data are all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received Delivery: (according to the main picture)