I used everything, Knife, plyers, hammer. I am going to sue you for 6000 dollars you bastards. you should have recalled this product , you knew you had a problem and did nothing about it. I cut myself and it could have been a lot worse. I can't rate your product because i couldn't give even one because that means you have done something right. User's recommendation: Don't even think about paying over 6 bucks for something you can't even open can't even open.