Have a 1994 WH 520h with a good sized front loader and is all that a man can need in a little tractor. I had ordered this bolt on Tooth Bar to give this small tractor some biting power knowing that I had some fabrication to perform for sure. NOT THE CASE...this Tooth Bar bolted right on as if it was a custom built piece. Extra heavy duty for sure! I would say over-done in "duty-rating", far exceeds the steel thickness of most front loaders I know of. Interlocks and bolts onto front loader!