Forney 72749 Twist Knot Wire Wheel Brush, 6" x 0.012" Wire, 1/2" - 5/8" ArborTwist knot wire wheel brushes provide high impact. Used in surface preparation prior to welding and for removing weld scale, spatter and heavy corrosion. Used for heavy duty cleaning applications. Diameter: 6" Arbor: 1 2" 5 8" Wire Size: 0. 012" (0. 304mm) RPM: 9,000 Provide high impact Used in surface preparation prior to welding and for removing weld scale, spatter and heavy corrosion Used for heavy duty cleaning applications. Wash hands after use.