DBI/SALA Capital Safety SecuraSpan Stanchion And I-Beam Base is for I-Beam horizontal lifeline system fits flanges 6"-12" wide, 2 1/4" thick and is ideal for steel construction applications. Base is extremely lightweight and portable that PRO ides fast and easy handling, installation and storage for maximum worker PRO uctivity. It includes single and multi span flexibility for complete customization of system depending upon the clearance below the work area and overall length needed.