Feature 1Suitable Scenario: Microscope lens ring adapter is suitably used for digital high definition multimedia interface USB video microscope camera. 2Aluminum Alloy Material: Microscope lens ring adapter is made of excellent aluminum alloy material, which has good durability and stability. 3Exquisite Craftsmanship: Our microscope lens ring adapter focusing holder is exquisitely made, easy to install and user friendly. 4Stable and Reliable: Microscope adapter focusing holder has stable and reliable performance and long service life, which can make the microscope fixed with more confidence. 5Light Weight: The overall weight of our microscope lens ring adapter focusing holder is light and can be easily stored in a backpack.Item Type: Microscope Lens Ring AdapterMaterial: Aluminum alloyInner Diameter: Approx. 50mm / 2in, 42mm /1.7inWorking Diameter: Approx. 50mm / 2in, 40mm / 1.6in .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Adapter1 x Adapter Ring2 x Hex WrenchNotePlease note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.