Weiler 79805 Dually 6" Root Pass Weld Cleaning Brush, .020" Steel Wire Fill, 5/8"-11 UNC Double-Hex NutDually 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. Feature a dual hex nut design that simplifies periodic flipping of the wheel for maximum cleaning action, long life, and safer use Narrow face brushes are suitable for cleaning root and hot passes and reaching into corners 3