Ryobi Die Casting - Home Diecasting, Ryobi, Tools, tier one, Automotive, Castings, Casting Ryobi is the global leader of high quality, technically complex aluminum casting products for the automotive industry. The Ryobi Group has a global presence. Headquartered in Japan – The Ryobi Group has full engineering capabilities, including R&D, Die Design, Product Design Support, and Process Engineering.