Horizontal Lifeline Stanchion Beam Clamp for use on I-beams. Inverted/Underslung version - clamps to I-beams to provide receiver for end and midpoint HLL stanchions. Fits 4.5"-14" beam width, 1/2" - 1.5" flange thickness (11.4 - 35.5cm width 1.2 - 3.8cm thick).*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.