Cup Brush Product Type Cup Brush Quick Change System Not Applicable Bristle Type Crimped Wire Bristle Material Abrasive Nylon Brush Dia 3 in Wire Dia 0.047 in Bristle Length 3/4 in Grit 180 Overall Length 6 in Compatible Tool Type Straight Grinder Color Silver Primary Material Application Carbon Steel Connector Type Shank Connector Size 1/4 in Operating Speed - Maximum 4 500 RPM Shank Length 1/4 in