Features: 1.Made of metal, high strength and non-deformation, super smooth surface finishing.2.The lens mount adapter is suitable for M42 screw C mount lens to mount for M4/3 camera body, like for Olympus or for camera body.3.Completely manual control, supports manual focus and manual exposure.4.Allow focusing to infinity.5.Precise thread ensures firm connection between lens and camera body.Specifications:Material: aluminium alloyColor: blackSize: Approx. 5.8 x 1cm/2.3 x 0.4inSuitable for M42 screw C mount lens to mount for M4/3 camera body, like for Olympus or for camera body.Settings: Put the red mark of the adapter ring and lens ring together.Turn the adapter counterclockwise until the fixing equipment clicks.In most cases, it will use manual or AV mode.Removal: To remove the adapter ring, loosen the retaining pin and turn the adapter clockwise.Packing List:1*Lens adapter ring.