Model Number: Vitrified P-1 Key Specifications/Special Features: Professional grinding wheel: for grinding raceway of bearingsAdvanced technology of bonding;Better to improve your accuracy of grinding;Higher efficiency;Long life band: 2--3 times than other ordinary grinding wheels. For grinding size grade speed outer raceway of inner ring 01- 500x10x203.2mm SA100L8VM 60m/s inner raceway of outer ring YX- 250x20x75mm WA60K8VT 45m/s YX- 250x20x75mm 3SG60J12VP 45m/s