Stanchion post for clamping to steel I-beams – Fits flange thicknesses form 1/2″ to 2 1/4″ . Fits flange widths from 8″ to 22″. Simple easy set up! Sold as one (1) each. Can be used as a single tie-off anchor point or as part of an MD Stanchion Post Horizontal Lifeline Fall Protection System.