... 3.ISO9001:2000 Certificate precision tungsten carbide ball for CNC machine . Precision tungsten carbide balls and valve seats* High ... tolerances of dimensions have respectively reached the standards of the machine industry: G5, G10, G16, G40 and G100 ... Xinhua West Road, Hetang district, Zhuzhou, Hunan, P.R.ChinaPostal code: 41200Tel: +86-731-28339730Fax: +86-731-28337210Mobile: +86-15973362017Website ...