A 6 Pack of screw caps - 4 Standard, and 2 Large - so you can now Coravin your favourite screw cap wines!
The idea is to whip off the original cap and speedily replace it with one of the Coravin screw caps. You can then use the Coravin to punch through the silicone centre, as you would a cork, and Voila!
Due to the fact that a small amount of oxygen will inevitably get trapped in the bottle with the screw cap changeover, the longevity of the wine under Coravin is perhaps not as long as traditional cork bottles. But you'll still easily get 2 months, possibly 3.