Can keys

 

— tool for opening cans. The classic can opener looks like a pair of handles with a can opener and a flywheel. This design is attached in a special way to the can, when you press the handles, the blade pierces the metal, and by turning the flywheel, the can rotates under the tool, and the can opener cuts the lid around the circumference. Opening jars this way is easier and faster than using a simple can opener.