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There are no more items in your cartThe cup shape to enables the maximum number of wire filaments to make contact with the working surface. Cup brushes are ideal for use on flat surfaces. These wire cup brushes feature 1/4" hex shanks. The hex shank allows their use with quick-change bit holders. Alternatively, the shank offers a more positive grip when used in a standard 3-jaw drill chuck. Twist knot brushes are more aggressive so better suited to heavier duty tasks such as removing weld scale, extra heavy rust and corrosion removal. 70mm in diameter.