Ths box advertises "ultra fine", the grinder itself has a "super fine, Turkish" grind setting, but according to Breville it is not capable of a very fine grind, certainly not a Turkish grind as advertised. They have been very, very responsive to my concerns, but I think buyers should know it seems to be an excellent general grinder but will not grind fine enough for a single wall espresso filter (water transit time - 5 seconds - it should be over 20 seconds) and barely fine enough for a dual wall espresso filter. If you need a fine grind, get the next model up with the shim kit. Once again - I stress that the folks at Breville.ca have been terrific in their assistance.