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Lincoln Electric high Impact twisted stringer bead brush for stringer bead cleaning, pipe fabrication, brushing expansion joints, and narrow grooves. High concentration of knots, precision balanced, and rugged construction. Arbor adapter and threads to fit most grinders and allows for changing the arbor size. Can also be used to reduce discoloration and corrosion on metal. Made from top quality high carbon tempered wires for long life. 4-inches brush diameter. 0.020-inches wire size. 5/8-inches x 11 UNC arbor hole. 3/16-inches face width. 20,000 rpm maximum speed.