SIT Heavy Duty Twisted Knot Cup Brushes for use on angle grinders, are designed to clean large areas efficiently and more aggressive compared to crimped wire brushes. Ideal for use on flat surfaces. M14 fitting for 115mm and larger machines 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