Your choice of anchor depends on the type of work being done. Anchorages are sold by what they connect to (general/all purpose, steel, concrete, roof or specialty), whether they are fixed or mobile, and whether they are permanent or portable. They all must provide a secure point of attachment for a complete personal fall arrest system, and must be capable of supporting a load of 5,000 lbs. (22kN) or of meeting OSHA’s criteria of a 2-to-1 safety factor.