Mcoplus Metal AF Auto Focus Macro Extension Tube Adapter EM DG Set For Canon EOS-M EOS M Mount Mirrorless Camera(10mm,16mm) Compatible With: Canon EOS M mirrorless lens digital camera. Tube Lengths: (1) 10mm.(2) 16mm. Built in Metal Bayonet & Plastic Body,color : black Equipped with electronic contacts which transfer exposure data It comes as a set of 2 tubes of different lengths which singly or in combination on makes it usable in 3 different lengths, 10mm, 16mm, 10+16mm.