PFERD Policap Abrasive cap holder is available in cylindrical shape with radius end. The holder expands during use, guaranteeing that the abrasive cap is firmly clamped in place. Matching, reusable holders in cylindrical shape is available for using abrasive caps. The high degree of fitting accuracy between the components ensures that the abrasive caps remain securely attached to the holder during use. Specification: Diameter (inches): 3/16; length (inches): 7/16; Shank diameter (inches): 1/8; Recom. Speed RPM: 40,000; Maximum Rotational Speed (RPM): 95,000.