Priced at around 30 one may well expect and does not have to expect these things make about 50 Kg "the opponent" stability - and that is what has occurred: the joining with wingnuts U-shaped profile was too soft and has immediately bent when the load was pushed over a grooved tiled floor. From a virtue of necessity making, I unscrewed the roles of support, they secured to a sturdy screen print board on which the aluminum box is now ready to drive and especially able to roll stands - despite now 60 Kg Content -