This is a great hitch, but it was too big for my 4500 lb trailer. This is for 6000-12000 lbs. The spring bars are 1 1/2" square steel. NOTE: ALL I have is what is shown in the pictures. The chunk with a 2 5/16" ball, and the two spring bars. The remaining parts, the brackets that mount on the trailer frame and the assorted pins and such, are available new for well under $200.