The AF Extension Tube Set can transform your Lens into a Macro Lens.This is used by attaching between camera body and lens of the 35mm single-lens reflex camera. It couples perfectly with the camera"s automatic diaphragm. * Tube diameter : ab.69mm. Tube Lengths: (1) 12mm.(2) 20mm.(3)36mm. * This extension tube consists of 5 parts: 12mm tube, 20mm tube, 36mm tube, Front Cap, Rear Cap. Package includes: Metal Mount Auto Focus Macro Extension Tube Set x1, English User Manual x1. * Material: Brass Chromed and ABS(Acrylonitrile Butadiene Styrene), color : black * Compatible with: Nikon F mount DSLR/SLR and Nikkor AF, AF-S, D, G and VR lens series.