Isigaba esingenalutho siyinto yejiyomethri ethile eyenziwe ngensimbi noma ngensimbi kanye nokokusebenza okunamandla athile nokuqina (okufana nepulasitiki, i-aluminium, i-glass fiber, njll.) ngokugingqika, i-extrusion, i-casting nokunye okunjalo. Kubandakanya insimbi ye-engeli, insimbi yeshaneli, i-I-beam, insimbi eyisikwele, i-H-beam, njll.into yejiyomethri ethile eyenziwe ngensimbi noma ngensimbi kanye nokokusebenza okunamandla athile nokuqina (okufana nepulasitiki, i-aluminium, i-glass fiber. , njll.) ngokugingqa, ukukhipha, ukusakaza nokunye. Kubandakanya insimbi ye-engeli, insimbi yesiteshi, i-I-beam, insimbi yesikwele, i-H-beam, njll.