Welcome to STI's HSS Producers Capability Tool. This tool was designed to help specifiers and those within the steel supply chain locate producers of specific sizes of hollow structural sections or HSS. To use, simply designate the size, material grade (A500 B/C, A1085 or A1065), and any seismic ductility requirements (optional) then click on the search button. A chart will display indicating the sizes of steel hollow sections (HSS) that are produced by STI member companies. Click on any colored square to view which STI producers manufacture the size and grade requested. You can also find a complete list of HSS producers who are members of STI on the Producers page of this website which contains additional information and more detailed contact listings.