... Material: aluminium, copper, stainless steel, carbon steel2.Cold forming; machine manufacturing3.Sizes: all sizes M2 - M1004.High quality and ... material:carbon steel(incude A3#,34#,45#,etc,),brass;6.finished:plain,yellow zinc plated;white zinc plated;black zinc plated ... but the highest qualitylet me introduce our factory brieflyQingdao Aoerxin Machine Manufacturing Co. Ltd. is a high-tech joint- ...