Cup Brush, Product Type Cup Brush, Quick Change System Not Applicable, Bristle Type Standard Twist Knot Wire, Bristle Material Carbon Steel, Brush Dia. 3 1/2 in, Wire Dia. 0.02 in, Bristle Length 7/8 in, Grit Not Applicable, Overall Length Not Applicable, Compatible Tool Type Right-Angle Grinder, Color Not Applicable, Connector Type Threaded Hole, Connector Size 5/8 In.-11, Operating Speed - Maximum 13,000 RPM, Shank Length Not Applicable