3.8mm + 4.5mm Security Screwdriver Tool Bit Set for Nintendo NES N64 Gameboy Black version is made of tempered steel. Silver version is nickel plated for corrosion resistance and is made of stronger heat treated, hardened steel. Opens games for Original Nintendo (NES), Super Nintendo (SNES), Nintendo 64 (N64), Virtual Boy, Original Game Boy, Game Boy Color, and Sega Game Gear.