... available 2. competitive price and good quality porcelain double thrown knife switch (3p) 1)Materials:procelain, iron , copper, zinc alloy ... etc.2)Colors:blue, yellow switch 3)superior quality knife switch 4)competitive price 3P Porcelain double Throw ... Knife Switch 1)Produce name:porcelain knife switch; 2)Materials Body:procelain knife:iron copper-plating,brass or ...