If you place your projector in a high place (e.g. on a shelf), you might have to position it upside-down to get the picture to appear on a wall. These stands are designed to hold a projector in that position. They're made for an Optoma HD83, but might fit other projectors, too.Attach felt pads to ensure that the projector does not get scratched, and rests snugly on the stands.