Those are standard ER collets. The only range limitation is how big they
come in. In the case of the Lee Valley one, zero to 3/4".

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Hi Prometheus

I got sidetracked and found you question on the collet holder, and yes
there are things like that, they tend to be a little expensive, for
the precision machining thats needed for those items.

They do have a very limited range, and come mostly in standard sizes
only.

Anyway here's a link to a set that would fit right onto your lathe.

http://www.leevalley.com/wood/page.a...330,49238&ap=1