These beads are the raw material for moulding parts or extruding sheets. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets, forming a fiber. The dry process involves extruding, annealing and stretching steps. Tool steels are used for cutting, pressing, extruding, and coining of metals and other materials. Heading is a metalworking process which incorporates the forging, extruding and upsetting process. Newer fiber designs include extruding fiber that splits into multiple finer fibers. The wet process consists of mixing, heating, extruding and additive removal steps. Manufacturers work to set industry tolerances when extruding, cutting or joining silicone rubber profiles. This property is of importance in forming, shaping and extruding operations on metals. On later versions it supports important modeling functions such as extruding, or beveling. Various patents cover machinery for extruding pasta of different shapes. Heating and extruding basalt yields stone wool, said to be an excellent thermal insulator. Hancock's machine was an adaptation of Bewley's tube extruding machine. This is the result of lava being displaced by new lava extruding from the vent. One approach involves the device extruding antennas.