PERFORMANCE, VALUE, LONGEVITY Prestress Services Industries, LLC (PSI) is the largest fabricator of bridge products in the Midwest and a leading fabricator of structural precast and prestressed concrete components for parking structures, warehouses, stadiums, manufacturing facilities, commercial buildings and other building projects. From standard products to the ever-increasing sizes of girders and specialty components, we deliver an unmatched combination of plant capacity, fabrication experience and transportation expertise. We are able to manufacture and deliver superior precast/prestressed components faster and more cost effectively than any other company.