Crimped Wire Cup Brushes are good for cleaning large areas efficiently and are not as aggressive compared to Twist Knot wire brushes. Good for use on flat surfaces. Ideal for polishing metal removing paint or rust and general metal preparation prior to painting. M14 fitting for 115mm and larger machines Diameter: 65mm (2 1/2") Max Speed (RPM): 12 500 Brass coated steel wire 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.