Good thing I wore goggles. I have a Dremel 4000 and have used it for many years and intentionally only buy Dremel parts and Dremel kits although there are other aftermarket accessories I can buy cheaper. I've always believed that a genuine Dremel brand is the best buy in the long run. I bought a new set today, or should I say it arrived today for a project I'm working on and the very first cutter blade broke in the EZ lock. This has never happened to me and I actually bought the whole set because I needed it. a wheel and thought I might as well stock up on my Dremel accessories with this purchase. I now have a nice cut on my finger trying to get the broken wheel out of the EZ lock. PS just added more pics because more just broke. Even before I used it. I've never experienced that with a Dremel.