Sigogi na asali na tarin kayan karfe

Hot-birgima karfe na karfe galibi suna da siffofi uku:U-dimbin zanen gado, Z-mai siffa kirji pilesda kuma takardar karfe tara. Duba Hoto na 1 don cikakkun bayanai. Daga cikinsu akwai tsattsarkan zanen gado da layin karfe masu ƙarfe sun fi tsada saboda samarwa, sarrafawa da shigarwa. Yana da 1/3 fiye da yadda keɓaɓɓen zanen ƙarfe. Yanzu akafi amfani dashi a Turai da Amurka. U-dimbin yawa takardar shela ana amfani dashi a Asiya, gami da China.