These heavy duty steel frames made especially to assemble cages that then lowered into shell beams. Support steel well over 2 tone each stand. Much more with greater capacity chain hoists Efficient - just hang stirrup on each frame - thread horizontal bars through placing those stirrups between - others from end after when assembled simply lower into place. No relying on others - just get job done efficiently. WE have 3 with 2 chain hoists etc that can go with them. These cost plenty so pick up on what works at less than to get made. Price for the 3 frames and 2 chain hoists