Heavy-Duty 3" Knotted Wire Wheel Cup Brush - Paint, Rust, Slag Removal - 5/8" 11 NC Heavy-duty surface-prep tool for use with angle grinders and other power or air tools Heavy-gauge steel wire knotted/twisted in strands for extra rigidity, shape retention, extended service life Great for paint, rust & slag removal; maximum 12,500 RPM Popular 3" diameter has superior maneuverability and access; weight 9 oz Steel hub with threaded 5/8" 11 NC nut fits most power tool arbors and adapters