Thats its, a trailer so to speak for your disc mower. I believe the hardest thing with a disc mower is hooking up to the 3 point of the tractor. You just never seem to be lined up just right to the 3 point and when you do get hooked up then leveling out the cutter with the top link.
This unit always stays hooked to the mower ... makes it "plug and play" ... back up, drop in the hitch pin and plug in the Hydraulics and go cut hay!!!