PFERD Cylindrical shape mounted felt point (ZYA) is mainly used peripherally. This also feature a Centre hole, which is optimal for face-down polishing. Specification: 3/4" Diameter (D) x 1" length (T), (T); 1/4" Shank Dia. x 1-5/8" Shank Length; Recon. Speed RPM 5,000 - 10,000 ; 23,500 Max. RPM.