corkscrews
They are not
A New York based company Metrokane is the manufacturer of Rabbit corkscrews. Rabbit corkscrews come in different varieties and the price of a pack of rabbit corkscrews range from $35 to $49 (pl see URL- http://www.amazon.com/Metrokane-Rabbit-Corkscrew-Foilcutter-Silver/dp/B00005NPHL for example)
none
none
No not yet but they might someday.
Corkscrews have rack and pinion gears.
corkscrews - screwdrivers - table screws -
Your local liquor store should carry an array of different higher-end corkscrews. If none of these do it for you, look on eBay, Amazon, and Overstock as these sites have many corkscrews for sale as well.
Twist off bottle tops, corkscrews, meat grinders.
Rabbit corkscrews are used for opening wine bottles. The corkscrew is manually screwed into the cork at the top of the wine bottle for a few turns. Once it has gone in an inch or so, the levers or rabbit ears are pressed down. This pulls the cork out of the wine bottle.
Corkscrews are readily available in basic cost effective forms at your local supermarket. If you prefer a fancier corkscrew set you can try your local Tobacco gift stores - they tend to have some great gift sets that include some of the fancier cork screws.