Premium Stringer Bead twist knot wire wheel brush. Stringer bead brushes are extra narrow to clean pipe welds between passes and other applications where a narrow brush face is necessary to do the job. Made from high carbon tempered steel and each tuft is perfectly positioned and set for perfect balance and optimum performance. Patented nut design has gripping points and raised nut making it easier to tighten and loosen on and off angle grinders.