Tapered Cork #16 (Fits Glass Carboys) Go to amazon.com Related posts Top 10 recommendation carboy cork FeatureNatural corkTaperedFor plugging holes, not for bottling DescriptionSize 16 tapered cork. Made from "XX" quality natural cork. Top diameter: 1-3/8 in, Length: 1-1/2 in, bottom diameter: 1-3/32 in. Made in Portugal.