Lift Arm Ball Socket, Cat 1&2, Heavy Duty Duty, 7/8″&1-1/8″ ID, 1-3/4″ bore length, 1-3/16″ sleeve width, 2-3/4″ OD, Zinc Plated finish.Lift arm combination ball joint. For 7/8″ or 1-1/8″ pins. Category I or II. 1/4″ thick race for light arms.