Item No.: GEZ12ES~GEZ152ES, GEZ25ES-2RS~GEZ152ES-2RSInner Race: Gcr15 Steel,hardened HRC 58-64,surface phosphated. Outer Race: Gcr15 Steel,hardened HRC 54-60,surface phosphated. Bore size d≧140mm: Inner and outer race are all Gcr15 SiMn. Sliding contact surfaces: Steel/SteelPhone: +86-592-580 8851 / +86-592-580 7618Email: sales@ldk-bearing.com ; benjamin@ldk-bearings.com