Casters collectively, including activities and fixed casters. Activities caster casters will we say, its structure allows 360 degree rotation; fixed castors not rotating structure can not be rotated. Usually two casters are generally with the use, such as the structure of the trolley is two directional wheels of the front, the back close to the promotion of the handrail are two casters.

Activities caster casters will we say, its structure allows 360 degree rotation; fixed castors not rotating structure can not be rotated. Usually two casters are generally with the use, such as the structure of the trolley is two fixed wheels of the front, the back close to the promotion of the handrail are two casters.