When buying a household corkscrew to open bottles, we should choose the most effective one. Therefore, let us not choose one, in which the blade has the shape of a twisted spiral, because it very often destroys the cork. Better is the one in which the spiral is milled from a metal rod. It has a deeper spiral pattern that does not damage the pull-out cork, as well as better screwing into the cork closing the bottle. Such a corkscrew will be perfect for e.g.. for removing plastic expansion plugs from holes in the wall.
