FOTGA Macro AF Auto Focus Extension Tube 10mm 16mm Set DG for Nikon 1 J1 J2 V1 Suitable for: Nikon 1 Mount Camera (J1 J2 V1) Diameter of the tubes: Approx. 61.5mm Tube length: 10mm,16mm Come with:Metal automatic macro extension tube 10mm x1 + 16mm x 1