Most commonly used for Limoncello (lemoncello). Sometimes called tasting corks or temporary corks. Can be inserted and removed by hand. Also used for oils and vinegar as well, but recommended for short term wine storage only.

These fit the standard cork finish wine bottles sold here, as well as the 375ml moonshine jug. They do not fit the 187ml bottles or screw-top bottles. 

Common terms: T-Cork, T-Top, Bar Top, temporary cork or tasting cork.