High Speed Small Grinder Knot Wire Wheel Brush, 4" Dia., 0.02" Fill, 5/8"-11 Arbor, Stainless SteelThe individual knot wire tufts of a knot wheel provide minimal flexibility for more aggressive brushing action Rugged knot type construction provides high brush flexibility, more uniform results, maximum safety and efficient operation at high speeds Brushes larger than 6" should be mounted on stationary tables; those 6" and smaller can be mounted to stationary installations or attached to portable tools STANDARD TWIST KNOT Aggressive, high impact