No sharp edges on the can or the can opener and extremely easy to operate. Lock onto the top of the can with a 1/4 turn then around you go till you hear a click or feel a slight change, a 1/4 turn back to release the opener and it is done. The lid is separated from the can at the factory seal, so no sharp edges ever because it has not cut the can. No spilt food and you can place the lid back on the can if you wish for storage. Or you can reuse the can for storing screws nails of even pens, pencils or crayons for the kids. It is all so the worlds best left handed can opener. Just switch hands and turn it towards you. Any can, anywhere.