Suitable for use in power drills. Most useful for hard to reach areas and grooves. 6mm shank. Specifications: 9584.0550: (Dia)50mm x (W)25mm. Max rpm: 15,000. 9584.0560: (Dia)60mm x (W)25mm. Max rpm: 15,000. 9584.0570: (Dia)70mm x (W)25mm. Max rpm: 15,000. 9584.0580: (Dia)80mm x (W)25mm. Max rpm: 12,000.