1. tool; means
そういえば、君は魔法具を持っていたね。Come to think of it, you had a magic tool, didn't you?
2. ingredients (added to soup, rice, etc.)
その間に、私は野菜などの具を切る。In the meantime, I cut up ingredients such as vegetables.
3. counter for sets of armor, utensils, furniture, etc.