CR2025: 20mm wide for Blue, Crystal, Gold, Silver and Red Save Game Batteries,Game Boy, GB Color, and Zelda Games Red, Blue Save Game
 CR1616: 16mm wide for Game Boy, GBA, and Color
 Screwdriver Bits (3.8mm and 4.5mm) are made of Steel and Laser Engraved.In order to open your game cartridges you will need a security bit.
 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.