PREPR Safety Can Opener 5 "It Works" 15 July 2019 This is one of the best tin openers I have ever used. Just make sure you lock it to the tin with the dial on the top. Once you have turned it all the way around, lift the lid. You may think it hasn't worked, it has, It removes the lid, clean cut from just under the top. No bits of paper getting in your contents as has happened with others in the past.