Known as the Hinds pick-up arm, it was used for lifting some 40 separate tilt-up panels on the 51,000 square foot building, according to R. S. Knapp, general superintendent for the McNeil Construction Company. When the panel is ready to be lifted , the upper flap of the carton the bar comes in is torn away and the bar turned out of the carton in an upright position. The crane shackle is attached at this point. One of the most important features of the lifting device is that the bar prevents over-stressing the concrete as it is hoisted into a vertical position. With other devices developed for this purpose the lifting force is usually directed against the tilt-up sections at different angles as the slab is lifted. The resulting stresses often cause panels to crack and chip.