What is an industrial caster

Caster is a general term, including movable and fixed casters. The movable caster is also called the universal wheel, and its structure allows 360-degree rotation; the fixed caster has no rotating structure and cannot be rotated. Usually two kinds of casters are used in combination. For example, the structure of the trolley is two fixed wheels on the front, and two movable universal wheels on the back near the push armrest.