وَعَلَّمْنَاهُ صَنْعَةَ لَبُوسٍ لَّكُمْ لِتُحْصِنَكُم مِّن بَأْسِكُمْAnd We taught him the making of metal coats of mail, to protect you in your fighting.meaning, the manufacture of chain-armor.Qatadah said that before that, they used to wear plated armor; he was the first one to make rings of chain-armor.This is like the Ayah:وَأَلَنَّا لَهُ الْحَدِيدَأَنِ اعْمَلْ سَـبِغَـتٍ وَقَدِّرْ فِى السَّرْدِAnd We made the iron soft for him. Saying:"Make you perfect coats of mail, and balance well the rings of chain armor." (34:10-11),meaning, do not make the pegs so loose that the rings (of chain mail) will shake, or make it so tight that they will not be able to move at all.Allah says:... لِتُحْصِنَكُم مِّن بَأْسِكُمْto protect you in your fighting.meaning, in your battles. ... فَهَلْ أَنتُمْ شَاكِرُونَAre you then grateful. means,`Allah blessed you when He inspired His servant Dawud and taught him that for your sake.' The Power of Suleiman is unparalleled And Allah tells: