Even when the load capacity is inscribed, the caster attachment fulcrum part breaks. The reason is that the strength of the castor mounting side strut is not on the caster side but due to the fact that the press-fitted die-cast part of the support side (actual diameter 25.6 mm in diameter) is approximately 20 mm in length. Although it seems that there will be no problem if the press-fit length is 30 mm or more, since the support pipe has been deformed, the caster is removed as a countermeasure. Castors became unnecessary because it changed to stationary type. For casters, the wheel diameter is small with respect to the notation load capacity, so the usage environment seems to be greatly influenced by the material and condition of the floor surface. At the P tile floor surface, a collapse occurs due to the small foil installation area. Also imagine that even a slight step will cause extra load on the struts to cause breakage. It is better to judge that it can be used only in the environment of concrete floor surface, no floor surface shape with no step at all.