A spudger tool that is used for iPhone screen replacements is usually metal, nylon or plastic and will help you remove the digitizer screen from the bezel of the phone without causing any damage. In most cases you will need to heat the front glass digitizer with a heat gun or blow dryer to soften the glue or adhesive that binds the parts together. Diving further into the body of the iPhone you will find many components that are secured to a logic board with flex cables. A plastic spudger can be used to disconnect some of the components along with the battery and the logic board itself.