The TonKor roof rail forms the contact line where PV module frames meet the mounting structure on rooftops. Installers set the structural baseline, position the rail along the planned line, then pair it with the selected mid and end clamp set to complete fastening in a controlled, repeatable sequence. The format supports staged builds, tidy joints when combined with a matching splice, and a clean finished appearance across long rows. Final pairing should be confirmed against the project bill of materials and the chosen clamp and splice solution.