This is a brand new Wiha T8 tamper resistant torx screw driver. Wiha screw drivers are manufactured in Germany and are of extremely high quality and as such they come with a lifetime warranty. Sega Genesis games use a large variety of security screw bits to open them. Most Sega Genesis games either use the 4.5mm or 3.8mm security screw bits; however a smaller minority use either a spanner bit or the T8 tamper resistant torx.