So, looking at a Denford that uses BT30.

Is it possible to 'hold' an end mill with a shank diameter of 3mm? Do I get a specific collet that goes into the tool holder?

If so, can anyone link what I should be looking at?

https://www.maritool.com/BT30-Tool-Holders This side has a load of options, just unsure what I need to be looking at. Previously on my Kress I had a number of collets to make up my requirements from 1 - 12 mm endmills. Does it work the same?