2pcs/set 3.8mm & 4.5mm Screwdriver Security Game Bits for Nintendo NES Snes N64 Gameboy Gamecube 3.8mm bit opens NES,SNES,N64,GameBoy and GameBoy Color cartridges 4.5mm bit opens NES,SNES,N64 and GameCube systems Diameter:3.8 mm/4.5 mm