Professional High Quality CNC Coupling(Tube union): 1)ISO9001 certificated 2)Material: ... steel,aluminum,iron Changzhou Bowei Precision Machinery Co.,Ltd. Professional High Quality CNC Coupling(Tube union) NameProfessional CNC parts(Tube unionMaterial ... and technical service Testing machine Caliper,Digital Height Gange,Coordinate measuring machine,etc Business scope CNC center maching,drilling,turning, ...