Babban fasali: A lokacin shirye-shiryen samfurin ƙarfe, ƙwanƙwasa samfurin shine babban tsari, bayan ƙwanƙwasa samfurin, bayan ƙwanƙwasa a kan ƙwanƙwasa na'ura, za a iya samun haske kamar madubi a farfajiyar, yana da fa'idodi kamar motsi mai laushi, ƙananan amo, sauƙin aiki da gyara, zai iya dacewa da buƙatun ƙwanƙwasa na ƙarin kayan aiki, shine kyakkyawan kayan aiki don ƙwanƙwasa samfurin.

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