The Jumbo Swivel Wheel is for the Jumbo MK2 and MK3 brick machinery, specifically on the operator side. The usage is to easily rotate the machine at the end of a production column. The wheel has been offered previously in rubber or polyurethane; but after customer feedback (and likelihood of concrete slab quality and cleanliness) the rubber is no longer an available option. There is no built-in brake by default since a custom brake adaptor is used to both brake the movement as well as keep the wheel aligned in its axis for straight movement when not turning (separate purchase).