Solid steel hitch balls are engineered to meet all safety requirements of VESC regulation V-5. Each ball is cold forged for superior strength. When installing hitch balls, torque all 3/4" shank diameter balls to 160 ft. lbs. , 1" shank diameter balls to 250 ft. lbs. , and 1-1/4" shank diameter balls to 450 ft. lbs.