Question about Sunne Pro300s

I don't have any information on that. I just selected screws that fit through the holes. Don't know how big they were. Play it by ear.

I had to go online to remind myself what it looks like; it’s mounted high up in our barn and is not easy to see without a stepladder. I presume you mean the screws with which you adjust the legs. I cannot give a specific answer to that. Maybe go online to the manufacturers and check out their spec sheet.