Can ER 11 collets fit in or be adapted to a Boch colt router ?

[magicniner]

I am using down to 2mm end mills with 6mm shaft. No need to use end mills which have the same shaft diameter as the cutter. In fact, it is better if the shaft is thicker since it makes the tool more rigid.

I use a lot of 6mm shank HSS that's considered "Disposable" in industry, small Carbide tends to be cheapest on a variety of shank sizes.