Second time ordered. This time arrive very fast! Outside diameter 6mm Inside diameter 3mm Thanks again :)
Seems good but not tested if its concentric. The inner diameter in the upper side it's 4,2mm, I make a photo but just could upload 5 photos on a review. If I find any problem I will came and make a second review, other wise the item it's 100% OK. Thanks Seller :)
This adapter is for 6mm to 3mm. I ordered to fit 3,175mm (1/8") bits on my 6mm cnc router. I have to work it around on the lathe with a 3,175mm bit and now works perfect with 0,025mm concèntrics runout. It's perfect now. Now I'm very happy with this adapter because I have ordered other 2 adapters but they have excessive concentric runout and that is a issue for tools live. Please notice that if you wanted for 6mm to 3mm it's good has it cames, and if you need a adapter from 6mm to 3,175mm you have to work it on your own. Thanks again seller.