Tube Brush, Operation Type - Spiral and Tube Brush Power, Single Spiral Tube Brush, Shank Style - Abrasive Brushes Single, Brush Dia. 0.25 in, Brush Length 1 in, Overall Length 3 1/2 in, Wire Dia. 0.004 in, Shank Size 0.125 in, Fill Material Steel, Max. RPM 2,000 RPM