... series. 2) Corresponding models range :605-6020 ,623-6220 ,6300-6320 ,6403-6413 3) Material: Gcr15 (Chrome steel) -China, (AISI) 52100 ... NACHI UBC TR KG HCHSeries 605-6020 ,623-6220 ,6300-6320 ,6403-6413ID size5 mm - 350 mmCage materialSteel , brass , Iron , plasticPrecisionPO ...