Quote Originally Posted by uli12us View Post
They sell an 1/2" to ER16 adapter as well. But, because of the size 1/2" to 10-11mm it is rather long and expensive. You need with the ERlike collets only 1/8, 1/4 and eventually 1/2" Those collets clamp the metric shafts as well. But the other diametres have no meaningful equivalent in metric. With a 3/16 you can't clamp a 5mm shaft, but 4mm, that isn't a popular shaft diametre.
I have ordered the full set because it would work out the same for just two sizes anyway.