Tube Brush, Operation Type - Spiral and Tube Brush Power, Single Spiral Tube Brush, Shank Style - Abrasive Brushes Single, Brush Dia. 0.325 in, Brush Length 1 in, Overall Length 5 in, Wire Dia. 0.012 in, Shank Size 0.115 in, Fill Material Abrasive Nylon, Max. RPM 2,000 RPM