Tube Brush, Operation Type - Spiral and Tube Brush Power, Single Spiral Brush, Shank Style - Abrasive Brushes Double, Brush Dia. 1.5 in, Brush Length 2 1/2 in, Overall Length 5 1/2 in, Wire Dia. 0.035 in, Shank Size 0.25 in, Fill Material Abrasive Nylon, Max. RPM 2,000 RPM