PFERD Combitwist single row power knot cup brush with external nut. Combitwist is a variation on existing knot styles in which the knots are alternately twisted to offer superior balance during rotation. This construction style offers a more aggressive and effective brushing solution for cleaning and deburring applications. Premium knot cup brush featuring maximum service life, improved balance, and fastest removal rates. For use on large surfaces where a great deal of roughing is required. Good for corners and angles, and removal of contaminants such as scale, concrete, slag, and marine growth. Recommendation for use suitable drive systems: stationary machines, and angle grinders. Gray carbon steel wire provides excellent abrasion and wear resistance, along with high flexing action. High strength filament able to remove heavy buildups. Good bend recovery. 7/8-inches trim length. 18 knots. 5/8"-11 thread size. Uses in industries area: automotive, transportation, mining, electronics, aerospace, welding, nuclear, textiles, food services, construction, petrochemical, farming, medical, shipbuilding, fabricating, defense, foundries and plastics.