Abrasive blasting operators use the proper equipment and machinery to smoothen rough surfaces by abrasive blasting. Abrasive blasting is commonly used in the finishing process of metal workpieces and for blasting building materials used in masonry such as bricks, stones and concrete. They operate blasters or sand cabinets which forcibly thrust a stream of abrasive material such sand, soda or water, under high pressure, propelled by a centrifigal wheel, in order to shape and smoothen surfaces.