Vivi Audio&reg; 3.8mm + 4.5mm Security Screwdriver Tool for NES SNES N64 Super Nintendo 64 NGC SFC MD 3.8mm opens game cartridges for Original Nintendo (NES), Super Nintendo (SNES), Nintendo 64 (N64), Virtual Boy, Original Game Boy, Game Boy Color, and Sega Game Gear. 4.5mm bit opens game cartridges for Sega Genesis, Sega Master System, and Sega 32X as well as systems for Super Nintendo, Nintendo 64, Game Cube, Virtual Boy, Nomad, Game Gear, TurboGrafx 16, and TurboDuo. Type:Tool Kits. Length: 6cm. Diameter:3.8 mm/4.5 mm.