Cup Brush, Product Type Cup Brush, Quick Change System Not Applicable, Bristle Type Crimped Wire, Bristle Material Carbon Steel, Brush Dia. 3 in, Wire Dia. 0.012 in, Bristle Length 1 in, Grit Not Applicable, Compatible Tool Type Impact Driver, Color Not Applicable, Connector Type Shank, Connector Size 1/4 in, Operating Speed - Maximum 4,500 RPM, Shank Length 1/4 in