Commercial food mixers are a different machine to the ones commonly used in the domestic kitchen. Commercial food mixers are built with much heavier duty components. The gears which are driven by the motor, and in turn, drive the mixing spindle, are made from heat treated steel. The motors are variable speed and more robust than a domestic appliance. This allows them to be used not only for mayonaisse and creamed potato, but also for dough. The KitchenAid mixers are more suited to lighter use, like cake mixtures, and are not really suited to dough.
All commercial food mixers are supplied with a range of accessories like flat beater, wire whisk and stainless steel bowl.