... Aluminum,Copper,etc MAX diameter machining size 1.0mm to 120mm,Max Tolerance +/-0.01mmsuface processing way Black ... During production, technicians self-check and Engineer spot check to assure the good quality. - QC inspect after products ... heaters, dishwashers, disinfection cabinet, washing machine, soybean milk machine,induction cooker, the overall bathroom, temperature switches, water heaters, rice ...