Slewing drives is a kind of gearbox, consisting of gear, slew ring bearings, housing, seals, and other components. It can safely hold radial and axial loads, as well as transmit a torque for rotating. Most of slew drives are worm drive gearbox.
The slewing ring bearing is a part of the slew drives. Small turntable bearing and large diameter thrust bearing are available according to your special requirements.