The Stopper/Tubing sizer easily determines the correct size of cork or stopper needed for any flask, bottle, etc. Just insert the thin triangular gauge into the vessel and the correct stopper size is read off the line at the top of the neck. Two scales are provided: One for rubber and vinyl stoppers and the other for corks. On the back side is a circular scale for sizing tubing outside diameters between 4 and 52mm.
