Casters are a general term, including moving casters and fixed casters. The movable casters, also known as the universal wheel, have a structure that allows for 360 degree rotation; Fixed casters, also known as directional casters, have no rotating structure and cannot be rotated. Generally, two casters are used together. For example, the structure of a trolley is two directional wheels in the front and two universal wheels in the back close to the handrail.

The fixed casters have no rotating structure and cannot be rotated. Generally, two casters are used together. For example, the structure of a trolley is two fixed wheels in the front and two universal wheels in the back close to the handrail. Casters are casters made of various materials, such as cast iron wheels, nylon wheels, etc.       It is used in industrial, commercial, medical equipment, machinery, logistics, environmental cleaning products, furniture industry, beauty equipment, food machinery, hardware production and other industries.