This is a tube holder for test tubes that are meant to be used as toothbrush holders. You mount the holder on the wall, or any other smooth vertical surface, with one screw on each side.
Note: Screws and test tubes are NOT inlduded! This is JUST the holder!
Testtubes can be bought at Amazon: http://www.amazon.com/150mm-PYREX-GLASS-TEST-TUBE/dp/B001DBF60E
(7$ for a pack of 6.)