i was lucky to find a brand new Sandvik ER collet to a good price ~12 bucks. I have been interested in comparing my low price china collets for a very long time. I decided to make a short video of this very unscientific quick test. Toolholder is a 20 bucks bt30 one from china. spindle is green bt30 one from aliexpress. i am measuring on a sandvik carbide endmill. please comment what you think about the results. my opinion is that it the china low price collets seem to be good enough for my hobbymachining. I said in the video " a little less runout", everything is relative though. If one think about it, it is actually 50% less runout on the expensive one)

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