CONAC 7/8" diameter Pulling Irons are available in hot dipped galvanized and self color finish. Pulling irons should be installed behind concrete reinforcing steel and tied to the rebar. Safe working load in tension: 20,000 Lbs Ultimate Mechanical Load: 70,000 Lbs. Note: Safe working loads based on approximate 3:1 safety factor with a minimum concrete strength of 4,000 psi.