... ,440.,440C..Diameter1.0-50.8mmApplicationwidely applies in the ramming bearing,the valve,the seal,measuring appCertificationISOHardnessHRC20-60Place of OriginShandong, China ... (Mainland)Brand NameUMTModel Number440Cgrade16-1000440C and General stainless steel widely applies in the ramming bearing,the valve,the seal,bicycle ,motorcycle,AISI ... .03016.0-18.0≤0.75≤0.60 304 Stainless steel ball