... 4.Tolerance: +/- 0.01mm Look clear photo of E27 cable electrical ring brass terminals :1.Size: according to your requires. 2 ... ,,, 3. plating: zinc plated ,nickel plated ,brass plated ,,,4.application:electrical products,,, product nametypematerialsurface treatmenttolerancesizeproduction ability Terminal connectorSteelcopperbrassBronzess steel AluminiumPaintPolishingZinc platedNickel ...