Forney 72758 Coarse Twist Knot Wire Wheel Brush, 6" x 0.012" Wire, 5/8"-11 ArborTwist knot wire wheel brush provides high impact. These wheels are used in surface preparation prior to welding and for removing weld scale, spatter and heavy corrosion. Design for heavy duty cleaning applications. Diameter: 6" Arbor: 5 8" 11 Wire Size: 0. 012" (0. 304mm) RPM: 9,000 Grit: Coarse Provide high impact Used for heavy duty cleaning applications Used in surface preparation prior to welding and for removing weld scale, spatter and heavy