Mitani Sekisan. 

Operating from its headquarters in Fukui, Japan, Mitani Sekisan Co., Ltd. specializes in the production and distribution of a comprehensive array of concrete products. The company's diverse offerings include various types of piles, such as prestressed concrete, PRC, SC, coupling, and F.T. construction piles, along with triple plate joints and related construction management tools. They also manufacture a range of concrete poles, including prestressed, high-diameter, and slender varieties, as well as specialized blocks like shake, surf, surf flats (including L types), and tine block S types. Beyond these prefabricated items, Mitani Sekisan supplies fundamental construction materials such as gravel and stones for civil engineering, railway ballast, and roadbed applications. Their inventory further extends to raw concrete, numerous secondary concrete items, and aggregates used in asphalt composites. The company also provides advanced structural solutions, including VS lateral grooves, L-type retaining walls, block holding walls, box culverts, flumes, and H-form PC piles, in addition to integrated solar/pile systems. Founded in 1946, Mitani Sekisan's operations are not solely focused on construction materials; the firm also diversifies into commercial property leasing, hotel management, environmental sanitation services, and information technology-related ventures.