Aiskaer 3.8mm + 4.5mm Security Bit Screwdriver Tool +Free Clean with a small brush.Support Open NES SNES N64 Super Nintendo 64 Cartridges & Systems. (Small) Includes 2 bits needed for Nintendo Products: 3.8mm , 4.5mm security bit.(A small brush included.) Made from steel. Measure 5 cm (2.0 inches) in length.The total length of the brush is 13 cm 3.8mm opens game cartridges for Original Nintendo (NES), Super Nintendo (SNES), Nintendo 64 (N64), V 4.5mm bit opens game cartridges for Sega Genesis, Sega Master System, and Sega 32X as well as system