Cup Brush, Product Type Cup Brush, Quick Change System Not Applicable, Bristle Type Crimped Wire, Bristle Material Carbon Steel, Brush Dia. 4 in, Wire Dia. 0.014 in, Bristle Length 1 3/8 in, Grit Not Applicable, Overall Length 3 1/2 in, Compatible Tool Type Right-Angle Grinder, Color Silver, Primary Material Application Carbon Steel, Connector Type Threaded Hole, Connector Size 5/8 In.-11, Operating Speed - Maximum 10,200 RPM, Shank Length Not Applicable