0.2-0.5 mls Centrifuge tube holder for larger centrifuges

This will fit directly into a 2 cms X 9.5 cms centrifuge tube and offers an alternative to the great dremelfuge(which I use). But if you own the larger centrifuge and want easily controllable slower speeds then the smaller PCR tubes will fit in here. I have a small hole in the centre on the top as a guide and then you may drill whichever PCR tube size you want. The centri12 has more length for the .3mls tubes and it can be resized on makerbot to 23mm by 27mms on longer sides.