How long (inches) are the brackets?

I just measured 12" before the bracket starts to curve up a bit (so the chairs don't slide off). This measurement is from the point where the bracket is attached to the "wall rail". Though I thought this rack was a little pricey, it's worth every penny.

How many chairs on the small?

Hi,Thank you for your inquiry. Depending on the depth of the chair, our Small Folding Chair Racks can hold 8-10 chairs. The Large Folding Chair Racks can hold 12-15.Best,Monkey Bar Storage

Will rack hold Stakmore chairs w upholstered seat cushions: 36" tall. Rear crossbar to hang on:12" across? Is it neces to find studs in cinder block?

I don't know anything about the stakmore brand W upholstery. I barely, but comfortably, fit 15 Mity-Lite chairs that are not upholstered. They hang upside down with the crossbar. lastly, studs are a must with this much weight. But the adjustability should make that relatively easy to accomplish.

Can this hold folding tv tables?

These are rated at 120lbs. I can not guarantee they will work for folding tv tables, but as long as they do not exceed the weight limit and have a bar to hang from these should work just fine.