<ul> <li>Front side - 65mm inner diameter</li> <li>Rear side - M65x1 male thread</li> </ul> <p>Made of high quality aluminium alloy.</p> <p>This adapter allows mounting projection lenses with 65mm rear diameter to a focusing helicoid with M65x1 female front thread.</p> <p>The adapter has flat spring protecting body of the lens from damage by securing screws.</p>