Instrument that allows the cutting of the neck of the bottle by thermal shock. Convenient to open bottles of wine from the very old Port, whose cork is not in a position to be removed with a vulgar corkscrew. The lower end of the tenaz, once strongly heated, hugs the neck of the bottle just below the cork, for a few moments. Then, the tongs are removed and cold water is poured over the heated area, which will eventually leave. The neck part is carefully removed with the cork and the wine is ready to serve.