Features: 1. Made of high quality alloy material with matte black anodized surface, durable, wear-resistant, anti-corrosion and extends its service life. 2. Completely manual control, supports manual focus and manual exposure. Allow focusing to infinity. 3. Finish coating treatment at the inner wall to avoid reflection to CMOS and affect the imaging. 4. Precise thread ensures firm and smooth connection between lens and camera body. 5. Support for PK mount lens to fit for Nikon AI mount camera body. Specification: Name: Adapter Ring Material: Alloy Color: Black Compatible Lens: for PK Mount Lens Compatible Camera: for Nikon AI Mount Camera Size: Approx. 7x6.4x1.5 cm/ 2.76x2.52x0.59 inch Weight: Approx. 83 g Packing List: 1 x Lens Adapter Ring 1、Made of high quality alloy material with matte black anodized surface, durable, wear-resistant, anti-corrosion and extends its service life. 2、Completely manual control, supports manual focus and manual exposure. Allow focusing to infinity. 3、Finish coating treatment at the inner wall to avoid reflection to CMOS and affect the imaging. 4、Precise thread ensures firm and smooth connection between lens and camera body. 5、Support for PK mount lens to fit for Nikon AI mount camera body.