Mercer Industries 184020 Knot Wire Wheel, 8" x 5/8" x (1/2", 5/8"), For Bench/Pedestal Grinders 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 .014 Carbon Steel