Tube Brush, Operation Type - Spiral and Tube Brush Power, Double Spiral Tube Brush, Shank Style - Abrasive Brushes Double, Brush Dia. 0.875 in, Brush Length 2 1/2 in, Overall Length 5 1/2 in, Wire Dia. 0.01 in, Shank Size 0.25 in, Fill Material Steel, Max. RPM 2,000 RPM