can opener
Tool used to open cans by cutting along the inside edge of the lid.
drive wheel 
Cogwheel that helps rotate the can so the lid can be removed.
cutting blade 
Knife that separates the lid from the can.
magnetic lid holder 
Part that holds the lid once it has been removed from the can.
pierce lever 
Device connected to the blade that the user presses down so it pierces the can lid.