4.5 mm Screwdriver for Nintendo Sega and TurboGrafx Video Game Systems by Mars Devices Security Bit Screwdriver for Vintage Video Game Systems and Cartridges Works with Super Nintendo (SNES), N64, Game Cube, and Virtual Boy Works with Sega Genesis, Nomad, Game Gear, Sega 32x, and Sega Master System. Can also be used with TurboGrafx 16 and Turbo Duo Some game cartridges require the 3.8 mm size Length 6 Inches