Mercer Industries 186520 Knot Wire Wheel, 4" x 1/2" x (5/8"-11, M10 x 1.25, M10 x 1.5), For Angle Grinders, Stainless Steel Provides excellent abrasion and wear resistance, along with high flexing action Superior rotational balance reduces operator fatigue and improves tool life The loosely-twisted knots cover a larger surface area and are ideal for heavy-duty cleaning and surface conditioning Industrial wire brushes are made from high quality steel .020 Stainless Steel