Castor and fixed castor castor divided into activity.
Castor also is what we call the universal wheel, its structure is allowed to rotate 360 degrees;
Fixed castor also called directional casters, it has no rotating structure, can't turn.
Usually two casters are generally use collocation, such as the structure of the trolley is in front of two directional wheel, behind near the armrest is driven by two wheels.
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