What size cork do I need to bottle wine?

A standard wine bottle (375, 750 ml or 1.5 L) all take a #9 cork. To use this size cork, you will need a corker. A corker is the tool to insert the corks. The number of the cork refers the size: a #8 cork is smaller, and is needed for some older or cheaper corkers. A #7 cork is used only if champagne bottles are used (they are not champagne corks) or the cork is being inserted by hand (no corker used). The #9 gives the best seal.