This is a foldable aluminum tray that can be fixed to a tripod screw hole. I purchased it used and used it only once. It can easily create a simple place to put photography accessories, tablets, etc. It's also excellent for storage as it folds up. 【Main Specifications】 ・Width: 250mm Depth: 170mm Weight: 245g ・Equipped with a 1/4 inch (fine thread) receiving hole on the bottom ・Non-slip rubber mat included