Pintle upper jaw closes onto the top of the 2in. ball (center position) to allow for towing trailers with lunette eye rather than coupler. 1-7/8",2" and 2 5/16" balls can be used for standard coupler towing - upper jaw locks into up or open position. Balls Included (qty.): 3, Ball Sizes (in.): 1 7/8, 2, 2 5/16, Ball Finish: Chrome