Model RSCI is a centrifugal throwout sprag type overrunning backstop with the inner race rotating. Only the inner race is designed for overrunning. The RSCI is not a self-supported design, therefore bearings must be provided to ensure concentricity of the inner and outer race and to support axial and radial loads. This model makes an excellent long-life backstop as there is no contact of the load surfaces during normal running of the equipment.