Automobile frames often use 5182 aluminium or 5754 aluminium formed sheets, 6061 or 6063 extrusions. The group founded Gulf Extrusions, an aluminum extrusion plant, in 1976. Body construction consisted of a rigid frame made of welded aluminum extrusions. Components may consist of tubing, extrusions, or castings. The Forgings and Extrusions facilities at Alcoa West were unaffected. It now is available in sheet, plate, extrusions, and forgings. The body was constructed by Nippon Sharyo using large hollow aluminium extrusions. Like other Aston Martin models, it will be constructed with bonded aluminium panels and extrusions. During the 1970s, the widespread use of aluminium extrusions for mullions began. Alloy 6061-T6 has considerable application for extrusions requiring thin sections and excellent corrosion resistance. Plates and brackets were cut from channel extrusions rather than being formed from sheet steel. REFCO uses aluminum from the group's Gulf Extrusions subsidiary. Most hot extrusions are done on horizontal hydraulic presses that range from . Roll-formed sections may have advantages over extrusions of a similar shapes. The front spar and lift struts were extrusions.