Mini Caster Wheels/4Pcs360 free rotation: You only need to paste the universal wheel at the bottom of the box; this heavy box can quickly and steadily move in any direction, saving time and effort. Load bearing capacity: The single wheel can withstand a load capacity of 20 100 Kg. Four wheels together provide a maximum load capacity. You can also add more wheels. Easy to install: You only need to use the self locking device that comes with it. You just need to stick the