Ken,
I honestly don't know and am not close to it right now. I have locked it up in the hangar and am packing to leave in the morning. I think it is for a 14' (maybe 16') boat. I had bought it used, with an Alumnicraft boat on it and it was definitely excessive for that boat.
I had to add to the tongue. If you look at the picture closely you can see where I put another boat tongue under the original. I had to extend it out 4' to allow for turning radius.