Apart from the production of open-type bearings can also be produced in a separate sealed bearings lubrication difficulties, is divided into: single and double shielded z,-2Z; single, double with non-contact sealing ring RZ, 2RZ-; single, double contact seals RS1, 2RS1. The bearings are suitable for low speed use, at the time of manufacture is mounted in the right amount of grease, the installation does not need cleaning, installing grease. Grease with corrosion and sealing