Businesses in metal formation and treatment change the shape, strength or surface properties of metal for use in manufactured parts and structures. Forming processes may include pressing, stamping, forging, rolling, drawing, bending and extrusion, using materials such as steel, aluminium, copper and their alloys. Work can be carried out to supplied drawings or specifications, from individual components and prototypes to production batches. Treatment services alter metal to improve properties or prepare it for use. These may include heat treatment, hardening, annealing, stress relieving, case hardening and tempering, as well as surface processes such as plating, galvanising, anodising, coating, polishing and shot blasting. Businesses may also offer cutting, finishing, inspection and advice on selecting processes. Customers typically include manufacturers, engineering firms and construction businesses requiring treated or formed components, fabricated parts or prepared metal stock.