Features: C-port M42x0.75mm adapter rings, male c port to T2 female thread lens converter. Allow you to use c Lens to t2 mount cameras. Quality metal aluminum material, lightweight and long time use. Easy to install and remove. There is no contacts in the adapter rings, so it cannot focusing to infinitely. Specifications: Material: Metal Aluminum Color: black Internal thread specification: M42X0 75mm (commonly known as T2 thread) Internal thread depth: 5mm External thread specification: C-port thread External thread depth: 3mm Flange distance: 6 5mm Package Includes: 1Pc Lens Adapter note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.