Dually 5″ 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. Wider face wheels can be used for cleaning filler and cap passes as well as for other surface prep and cleaning applications. 7/16 in T of face plate. Tool: right angle grinder. .