... & milling process 3 Range of internal hole aluminum flanges Milling precision: 0.02mm aluminium bronze flangesGrinding precision: 0.001mm aluminium bronze flangesGood workers ... quality controlMaterials: copper, aluminum, steel, stainless steel aluminium bronze flangesFinish: anodizing, electroplating, baking, electrostatic sprayColor: black or silverApplication: parts of device, jigs ...