75mm Steel Crimp Wire Cup Brush with hex shank Steel Wire Bordo hex shank crimp wire cup brushes are designed for use with low speed electric drills for removing scale, rust, and paint and other surface preparation including deburring and polishing. Crimp wire brushes are not as aggressive as their twist knot equivalents. These brushes are constructed using hi-tensile wire to ensure superior performance and a long life. Max. RPM: 4,500