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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.
A stem caster is an assembly containing a wheel or set of wheels mounted onto a fork, with a stem for attaching it to the bottom of an object. They are usually found in sets of four and are used to provide mobility to an otherwise stationary item. A stem caster can be either rigid or swivel.