Dually 6" Filler Pass Weld Cleaning Brush features a dual-hex nut design that simplifies periodic flipping of the wheel for maximum cleaning action, long life and safer use. 5/8"11" double hex nut for use on right angle grinders. The one-piece, dual-hex nut is designed to provide adequate tool clearance so there is no need to remove the guard from the grinder in order to change the position of the wheel. Weiler's stringer bead wheels are the most effective weld cleaning tools for the most demanding users. Our premium weld cleaning brushes are manufactured to the most stringent quality standards, utilizing the highest quality wire available. The twist puts all the sharp tips at the end of the knots, making them the fastest, most aggressive weld cleaning tools on the market.