MINI Tool Box Series. COBAKO is a mini toolbox series by TOYO STEEL - based on a concept of our iconic Camber-top Toolbox. From the folding to assembly process, COBAKO is hand-crafted by our artisans. From your favorite stationary, watches, or small mobile items, it can add a nice accent to your interior too. COBAKO can store many miscellaneous items with a “kawaii” feeling. Japanese Stainless Steel Tool Boxes. These are the real deal - like tiny (functional) works of art! Established in 1969, Toyo Steel was the first company in the world that successfully developed a deep drawing technology to make a seamless steel toolbox from a single sheet of steel. Their toolboxes are seamless, light weight, with a round gentle handle and no sharp corners. They also have outstanding durability and functionality.