I could be wrong, but looks like a disc made for a garden tractor that we see a lot if around here. Looks small for a Cub disc. We've chopped up quite a few of them and made several discs for atv's to cut up remote deer plots with. Put a tongue on it, one set of discs front, one rear, and a set of dolly wheels mounted to trailer jack in the middle to let the wheels up & down. Works great for that.