[Features] ●Both sleeves have fixed handles to prevent objects from falling in the direction of travel. ● Uses standard radial bearings for the wheels to move lightly and quietly. ●Can be changed to all-flexible car specifications using replacement casters (sold separately). ●Because it is powder coated, it is a clean and environmentally friendly product. ●It is a top plate (503EBN) with built-in large reinforcement structure that does not bend even when 550kg of luggage is placed.