Wonderful!
I’m not sure about a European source, but you can do a search for “611 collet” in the forum and come up with a few good threads. Here’s one that has links to both Elaire and Precise Bits: DWP611 Question - #3 by AlanDavis
I bought a set from Precise Bits since I plan on doing a bit of metalwork and need maximum precision, and theirs had a little higher precision than Elaire. If you’re primarily doing wood or plastic, the Elaire sets are good enough and a lot cheaper.