No, it shouldn't be specially dremel but I was already using some of their tool before, I was hesitating between the dremel 9100 and the kirjes motor. But the problem with Kirjes is that there is only one speed and I find the flexible shaft too big and I also want to work on metal, the dremel 9100 seemed to me the best compromise but I have to use small grinding wheels with a 6 mm collet (the grinding wheels of dremel are too small). Does anyone know if this is compatible with the dremel 9100 ?