The basic type of Cross-Roller Ring, in which the outer ring is separable while the inner ring is integrated with main body.

This model is a compact type of model RB with extremely thin outer and inner rings. It is optimal for areas where the swiveling unit needs to be light and small.

The main dimensions are the same as that of model RA. Since the outer ring also has high rigidity due to a single-split structure, this model can be used also for outer ring rotation.