1.GCR11or GCR15 material 2.high precision long life 3.ISO9001 ,OEM 4.good quality and price Materialchrome steel(GCR15) or carbon steel(GCR11)HardnessHRC60-65Tolerance standardGB/T307(ISO492)CertificateISO9001 Packingsingle color box or tube or industrial paperOEMwe have 10 years experience of OEMH.S Code84822000Service RangeOEM brand,Specially produce diversified brand for customer ...