... , copper, brass, iron, zinc alloy etc.2)Colors:blue, yellow3)superior quality knife switch 4)competitive price2P Porcelain double Throw Knife ... to receive your inquiry.1)Produce name:porcelain knife switch;2)Materialsbase:procelaincover: plastic or bakeliteknife:iron copper-plating,brass or copper, or ... to cooperation with us and seek business development together. knife switch 2 pole double thrown 30A