1Adopts high quality metal materials, lightweight, sturdy and durable 2Can decreases the lens focal length for close-up shot and won't alter the image quality 33 rings/set, 12mm, 20mm, 36mm, can be used independently or in combination to get different magnification 4Fits tightly onto cameras, copper conducts inside support auto focusing 5Good accessory for photography lovers, a good substitution to expensive macro lenses for macro photography Features:Adopts high quality metal materials, lightweight, sturdy and durable. Can decreases the lens focal length for close-up shot and won't alter the image quality.3 rings/set, 12mm, 20mm, 36mm, can be used independently or in combination to get different magnification.Fits tightly onto cameras, copper conducts inside support auto focusing.Good accessory for photography lovers, a good substitution to expensive macro lenses for macro photography.Specification: Brand: ForMeike Model: MK-N-AF Color: Black Options: B(Plastic) Magnification: Adjustable (12mm&20mm&36mm) Suitable for Nikon F mount DSLR Weight: Approx. 215-225g Package List:1 x Lens Adapter Rings Set1 x Manual