Stanchions attach to rebar loops in concrete bridge beams. Loop dimensions are 2-1/2" in ID and 9" max height. Use #4 rebar, minimum half inch, grade 40 or 60. Stanchions are the same as those used in teh Universal System and are available in 5,6 or 7 ft. These systems require tiebacks made of 2 inch 18,000 lb. sling webing with ratchet tensioners.