Mayline supplies this to Wayfair needs to do some rework. (1) Larger instructions, whether you are young or old the size of the drawing  (there were no written instructions) are toooo small. (2) The tray that tilts, just keeps on tilting even after you have it in the flat position . (3) There are 4 casters only 2 will touch the floor at a time , not always the same 2 on one leg. 
This serves the purpose for which I purchased it but it could be better built.