Wouldn t you like to be able to open a can of crushed tomatoes without having to wonder if that s tomato sauce or blood you see? This patented design opens cans without leaving sharp edges on the can or the lid. And because the cutting wheel never even comes in contact with the food it eliminates the risk of cross-contamination. That s right this can opener is basically the safest one of its kind—and it s the easiest to use too. Set it on the rim of the can (parallel to the counter) and twist the knob until you feel the lid release.