This is a tray for painting posts. In my specific use case, it is for a servit post that is used to ground the frame of an electrical stand. We paint these posts with an anti corrosive zinc paint, and this is far faster to use than messing around with tape and cardboard to mask off the frame. I've designed this model to function with a 5/8ths inch hole for the bottom of the post, and leg rails to center it on a 2 inch wide square tube.