... ISO9001:2000 2. High precision 3.good quality with competitive price StandardAISI, GB, JISGrade304,316,316L,420,440.,440C..Diameter1.0 ... widely applies in the ramming bearing,the valve,the seal,bicycle ,motorcycle,AISI 440CSize :1.0-50.8mmGrade:G16-G1000Chemical composition ... .0≤0.75≤0.60 Stainless steel ball at good price