Horizontal Lifeline (HLL) 8mm HLL DBI Sala, life support system in working at height for installation on walls, steel beams, concrete and masonry work, etc., helping to prevent falls while working at heights Installed for safety in walking and working on high ground such as maintenance work, sewer cleaning work, solar panel cleaning work. And other types of work by which the life support system on high It serves to determine the path of the operator from one point to another. especially in high areas that may fall.