Ƙofar wuta ta ƙarfe yana da ƙarfin ƙarfi da kyakkyawan tasirin kariya na wuta. Ƙofar kariya ta ƙarfe ta kasu kashi uku: A, B da C bisa ga aikin juriya na wuta. Ana iya amfani da kofofin da ba su da ƙarfi na ƙarfe na maki daban-daban a wurare daban-daban.

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