... .005mm 2.roundness tolerance is 0.002 or lower plastic injection moulding machine parts Yize mainly engages in design and manufacture of precision ... : SKD11,SKH9,SKH51, SKH553)technique standard : according to national standard GM, JIS,DIN,AISI ect, and other national standard to making4 ... exstence is invaluable for the development of the company plastic injection moulding machine parts