... brass5)Screw material: stainless steel, nickel coated ironCeramic material: talc powder& olefin, 92%Al2O3,99%Al2O3Bakelite material is also ... available, black colorTerminal block type:4)Ceramic material: talc powder& olefin, 92%Al2O3,99%Al2O35)Bakelite material is ... also available, black color4)Ceramic material: talc powder& olefin, 92%Al2O3,99%Al2O35)Bakelite material is ...