Triple-S Steel's Fehr System Jigsaw Puzzle Triple-S Steel's Fehr System Curious where 12,000 tons of structural steel might hang out between mills and the fabrication shops? It's not just in limbo--it has a designated place at a steel service center. Service centers are a crucial link in the fabricated structural steel supply chain, and the Denver outpost of Triple-S Steel, one of the country's largest service center networks, is leading the way in efficiency. Go behind the scenes with Modern Steel Construction at aisc.org/the-spaces-in-between. Immerse yourself in Triple-S Steel’s Fehr system--the first of its kind in the U.S.!--with our puzzle of the week.