Osborn high speed small grinder wheel brushes with standard twisted knot work aggressively, yet smoothly and efficiently on air tools or portable power tools. Applications: cleans grooves, t-connections, welded beads and surface prep. Stainless steel wire - all Osborn stainless steel wire, straight or crimped, is Type 302, highly resistant to corrosion and high temperatures. Used in brushing stainless steel, aluminum, and other exotic metals. Particularly suited for nuclear work, naval, aircraft, and aerospace construction. It has outstanding cutting action and excellent fatigue resistance for long, efficient brush life. Standard Twist Knot is good for cleaning grooves, t-connections and welded beads, and for general surface preparation.