OR003-00103-6B 2.3mm Shaft
Product works fine. Great replacement part. If you need them buy them here, of course they have some of the best prices on the internet.as it does say 2.3mm not 2mm it is also the 1 on the far rightThe picture shows 8 different adapters.When you get it ther ie only one.The one that of course don`t work.What is going on.this is for duct fan unit
http://hobbyking.com/hobbycity/store/uh_viewItem.asp?idProduct=4244&Product_Name=EDF_Ducted_Fan_Unit_6_Blade_2.17inchThis adapter is suited for the 55mm (2.17") 6 bladed fan. It is the one completely on the right in the picture, so press on type and with grub screws.