... ISO9001:2000 Certificate precision tungsten carbide ball for CNC machine . Precision tungsten carbide balls and valve seats* ... of dimensions have respectively reached the standards of the machine industry: G5, G10, G16, G40 and ... , good wear resistance and good corrosion resistance. Type and specifications Dia.(D)Inch3/47/815/1611 ... payment terms of T/T, D/P, D/A, L/C, western union, paypal and etc;8 ...