I originally thought the included hardware was too small of diameter, but after installing, I see why it is the diameter it is. I still feel the hole diameter in the mount should be reduced (bolt holes that are used when mounting plate to ATV) to match the hardware better, but it will work for it's intended use as-is. I am pleased with the thickness of the plate that this winch mount was made out of; I was expecting it to be thinner material.
Was going to fabricate a mount but found this one. For the money wasn't worth making and made in USA. Had to put spacers on two top bolts otherwise it fit perfect. Well worth it.