The A.0017ZP part is a Pawbol trailer hitch ball mount, which is designed to be used in various combinations with a trailer hitch ball and a 1-7/8 inch trailer hitch ball. It is a heavy duty steel construction for towing recreational vehicles such as snowmobiles, ATVs, and boats, as well as other applications requiring a heavy-duty ball mount. It features a zinc-plated finish for resistance to corrosion and rust. The A.0017ZP comes with the necessary bolts, nuts, and washers, and has a tongue weight capacity of up to 500 lbs. This ball mount is designed to fit any 1-7/8 inch trailer hitch ball, making it an ideal choice for many recreational vehicles and utility trailers.