Check the listing for details. C Mount to M42 Screw Thread Lens Mount Adapter Inner 25.4mm Outer M42 C-M42. Condition: New. Listed at 8.88 USD. Description: C-M42 mount adapters With flangeAttach C mount screw mount lens to M42 screw mount body with this adapter. Or for modify lens purpose.Specifications: Female mount (inner) : C Mount (diameter 25.4mm) Male mount (outer) : 42mm(diameter) x 1mm Material: aluminium Brand new and unused uPackage includes:1 x Lens mount adapter Installation: Rotate snap Directed from factory,welcome wholesaler!!To Dear Customers We will try our best to be the best seller and serve you optimal service, your support is very important to us. If you have any problem, please contact us before you leave any negative feedback, ebay or paypal dispute. Your appreciation is very important to our business. Please kindly leave us a ★★★★★ in each item. We will be better with your support.