Cup Brush, Product Type Cup Brush, Quick Change System Not Applicable, Bristle Type Crimped Wire, Bristle Material Brass, Brush Dia. 2 3/4 in, Wire Dia. 0.012 in, Bristle Length 7/8 in, Grit Not Applicable, Compatible Tool Type Straight Grinder, Drill Press, Impact Driver, Pencil Grinder, Color Not Applicable, Connector Type Shank, Connector Size 1/4 in, Operating Speed - Maximum 8,500 RPM