... (mm) Product Typebarrel nuts MaterialStainless steel, Carbon Steel, Aluminum alloy, Zinc alloy, copper, brass, titanium etc.Machining methodcnc Turning, Milling, Drilling ... , threading, stampling, punching etc..Surface finishPolishing, and Chrome plating, zinc plating, blackening, Nickel plating, ElectrophoresisColorMetal colors availableOEM & ODMAvailableFOB PortShanghai ...