Head is interchangeable - creates both end and bypass stanchions. The end stanchions are used as end anchors for Horizontal Lifeline systems with provisions for installation of tie-back cable. The bypass stanchions are used to shorten effective lifeline length when it is necessary to reduce line lengths and/or fall heights. *This item is sold as part of a complete Engineered Horizontal Lifeline System or as a replacement part for an exisiting system. Required training on this item.