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Typical swivel caster. A caster (also castor according to some dictionaries) is a wheeled device typically mounted to a larger object that enables relatively easy rolling movement of the object. Casters are essentially special housings that includes a wheel, facilitating the installation of wheels on objects.
1 Axle - the part at the center of a wheel; a wheel rotates around an axle with the help of ball bearings. 2  Body mechanics - refers to the best or safest body position to use in order to accomplish a heavy task.  Casters - the two small wheels at the front (or the rear) of the wheelchair which swivel in all directions.