Model RB(Separable Outer Ring, Type for Inner Ring Rotation) Being the basic model of the Cross-Roller Ring, despite the minimum possible dimensions of the inner and outer rings, its outer ring is separable while the inner ring is integrated with the main body. This model is used in locations where the rotation accuracy of the inner ring is required.
https://www.yogiemachinery.com/bearing/crossed-roller-bearing/cross-roller-bearing-rb12025.html