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A screw is a type of fastener, in some ways similar to a bolt see Differentiation between bolt and screw below , typically made of metal, and characterized by a helical ridge, known as a male thread external thread . Screws are used to fasten materials by digging in and wedging into a material when turned, while the thread cuts grooves in the fastened material that may help pull fastened .
Neues Wohnbauprojekt "Gompitzer G rten" Kimmerle im Dresdner Westen GOMPITZ. Modernes Wohnen am Stadtrand. F r ein weiteres Wohnbauprojekt .