... :15-30days 5. Nice after-sale service SpecificationDimension:0.3mm to 60mmMaterialChromium, Mn, Mo, 9Cr18,3Cr13, ... Test, Durometer, and Coating thickness testerWorkforceA group of experienced production technician, sophisticated engineer and dedicated QC.About ... passed the ISO9001:2008 certificate and the third pary BV certificate,and we hope to cooperate with you . Small Low Carbon Steel Balls