... High Quality CNC Coupling(Tube union): 1)ISO9001 certificated 2)Material:Copper,stainless steel,aluminum,iron Changzhou Bowei Precision Machinery Co.,Ltd. Professional High Quality CNC ... Coupling(Tube union) NameProfessional CNC parts(Tube unionMaterial Copper ... Coordinate measuring machine,etc Business scope CNC center maching,drilling,turning,etc ...