Security Bit Steel SET 3.8mm + 4.5mm Security Bit Screwdriver Tool (7cm Length) Open NES SNES N64 Super Nintendo 64 Cartridges & Systems Fits 1/4" driver. Made from steel. Measure 7 cm (~2.75 inches) in length. 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.