This kind of Slewing bearing is also the most common type, it is made up by two Rings, Rollers & Support blocks, with compact conformation, light weight, high precision, it can bear both Axial& Bigger Radial load and the moment at the same time.
It often be used on hoisting and transporting equipments, and the military projects.
The dimension scope  is from 100mm to 6500mm, in large amounts, the kind of Slewing bearing dimension always be less than 4000mm.