... 2) iron,copper, zinc alloy 3)Safe usage, good quality & low factory Electrical Porcelain Knife Switch1.Specification:3P 100AD 600V 2. ... :copper or aluminium availableis in iron,copper, zinc alloy etc.or can be customised3.Different sizes,different colors ... according to customer's requirment.3.Advantage:Safe usage, good quality ,timely delivey date, ...