Nintendo use proprietary screws on their cartirdges to prevent them being opened and repaired. This 3.8mm Gamebit is a Screwbit that you can fit onto the end of any long-barreled socketed screwdriver (found in most toolboxes) so that you can open up your N64, SNES or Gamecube cartridges.
It will also open up Virtual Boy, Game Gear and some Gameboy cartridges as well.
