RING TERMINAL/3/8 inch, 9.53 mm stud/tab size, not insulated, tin plating, copper material, 12.8 mm maximum bundle diameter. for use with 2/0 gauge wire. 321584RING TERMINAL/9.53 mm stud/tab size, not insulated, tin plating, copper material, 12.8 mm maximum bundle diameter. for use with 2/0 gauge w..