Product DescriptionMaterialStainless steel, copper, brass, carbon steel, aluminum etcSurface TreatmentZn-plating, Ni-plating, Cr-plating, ... precision parts and engineering milling, turning, surface polishing, cutting, EDM spark molding processing services. Before we start your ... process. Most important, we will provide the original Cert for all kinds of materials.2. Tolerance:CNC machining tolerance ...