Features: Features:brand new and high qualityCS C-RMS Adapter Rings Objective Lens Adapter RMS to C CS Thread M42 for Industrial USB CD Camera Connect with Microscope RMS Objective Lens PhotographySpecificationItem style: Objective Lens Adapter RingsInner Thread: RMS 20.2x0.705 (fit RMS microscope objective lens)ApplicationThis adapter rings can connect your objective lens with your M42 USB or CD camera, then you can take photo from objective lens directly.Package Included1x RMS-C M42 adapter ringsAttentionOnly the adapter rings included,NOTincluding objective lens and the camera.Two styles will be shipped at random.Note:Transition: 1cm=10mm=0.39inchNo retail package.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!