Feature:1. New macro extension tube kit for Nikon film and digital SLR includes 3 extension tubes-7mm, 14mm, 28mm adapter and a male/female interface(height over 11mm).2. Can install lens tube between lens and camera body to select macro lens range.3. Can be freely combined application and maximum can constitute eight kinds combination.4. Do extinction treatment inner the ring to avoid the influence of reflection on the image.5. Made of high quality aluminium alloy material, sturdy, durable and long service life.Specification:Condition: 100% Brand NewItem Type: Macro Lens Adapter RingMaterial: Aluminium AlloyColor: BlackQuantity: 1PCSMount: for AI MountFitment: for Nikon AI Mount Camera LensWeight: Approx. 122gSize: Approx. 7mm/0.28inch14mm/0.55inch28mm/1.10inch.Package List:1 xMacro Lens Adapter Ring