... colors according to customer's requirment 4.three terminal holes Specification as following or according to ... customer's specific requirement: Product nameporcelain terminal blocksElectric Pressure250V,380V,500VElectric current5A,15A,30A,60AMain ... materialceramic body Metal accessoriesbrass,copper(brass) with nickle plated,iron screwUsageconnect wires three terminal holes porcelain terminal block