Deluxe Game Batteries Kit perfect for or Game Boy, GBA, and Color. 5 Pcs CR1616 3v 16mm Lithium Batteries with Solder Tabs, for horizontal mounting. Screwdriver Bits (3.8mm and 4.5mm) are made of Steel and Laser Engraved. Triwing Screwdriver is roughly 11cm made of Steel. 3.8mm, 4.5mm and Triwing screwdrivers can help you perfectly replace the game battery saved in the video game cartridge.