Aluminium extrusion refers to structural aluminium profiles that have been pushed through a die to create a specific cross-section shape. The most common examples in New Zealand are window and door frames, aluminium ladders, curtain tracks, and shower enclosures. Extrusion is one of the cleaner aluminium grades because the material is typically uniform and free of cast alloys. At endless metals in Auckland, aluminium extrusion is a popular drop-off item, especially from builders and glaziers replacing joinery. To get the best price, remove glass, rubber seals, and screws before bringing your extrusion to the yard.