Twisted Knot Cup Brushes are good to be used to clean large area efficiently and more aggressive compared to crimped wire brushes. The steel supported rings reduce the wire flare and have more aggressive effect.. Good for use on flat surfaces. Heavy duty, cleaning of large metal surface. Weld scale and corrosion removal. Pre-paint surface preparation. Ideal for cleaning welds and fabricated steelworks. Suited for use on appropriate angle grinders.