Color Black Brand Commlite Model CM-ME-AFN Material Copper-Aluminum Alloy + ABS Quantity 1 Piece Compatible Brand Nikon Compatible Models All AI Nikon lenses and Nikon DSLRs Lens Diameter Others12mm+20mm+36mm Other Features The Commlite Metal AF Extension Tube Set can perfectly transform your Lens into a Macro Lens for great Macro shooting; It drives the lens by film or digital sensor and does not affect aperture and image quality; Meanwhile it is combined with 3 pieces of different tubes (length: 12mm 20mm 36mm) which can either be used separately or in any combinations (totally 7 different combinations) to satisfy your different magnification requirement; Furthermore the tube is electronic one that can achieve functions of Auto-focus as well as TTL auto exposure by working with all AI Nikon lens. Packing List 1 x Macro extension tube 1 x Pouch 1 x English user manual