●Size: 606ZZ (Inner Dia.=6mm, Outer Dia.=17mm, Thickness=6mm). ●Shields on BOTH SIDES of the bearing to keep dust out. Suitable for high speed operation. ●Made from High Carbon Steel, durability and resistance to under heavy loads. ●ABEC Tolerance 1 (P0) for most general use. ●Same As 606-2Z / 606Z / 80016. Pre-Lubricated, Easy to maintain.