1)long hinge 2) material stainless steel, iron 3)used for truck & car, ... The products introduction as following:1, products name:Stainless steel hinge2, Material:Stainless steel, copper, aluminum, iron3, Surface treatment:Electroplating: ... materials row hinge, piano hinge, heavy row hinge and bolt, small hinge, AA column, aluminum ladder column, stainless steel ladder column, stainless steel bracket. ...