Standard folding tables are just right for sitting at, but too low for standing behind. These are "Lift Your Table" folding table risers / extenders. They are the "STRAIGHT LEG KIT" and they lift up a folding table so you can stand and work at it. I bought them on Amazon thinking I was going to get into sewing, but that didn't materialize. I barely used them and they sell on Amazon for $34.99 + $10.49 shipping.