Many screw-cap food containers are difficult to open. This opener makes it easier to remove screw caps ranging from 1" to 3-1/2" in diameter.
It can also be used effectively on the much-cursed press-down-and-turn child-proof caps on drug containers. In addition, it has a standard bottle opener and a built-in lever for opening cans with a pull loop on the top.
The fifth use is to cut sealed plastic food containers ranging from bacon packs to the internal bags used in dry food boxes such as cereals and crackers. The cutters are inside the handles at the large end.
The overall design increases leverage force in all applications. 5-3/4" long.