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2" round brush fits for small scale cleaning. Perfect for corners and harder to reach areas
3.9" round brushes are suitable for flat surfaces such as kitchen and bathroom surfaces, grout, linoleum, fiberglass shower enclosures, brick, tile, etc
3.3" spin brush is great for corners and contours and curved surfaces that are heard to reach, LIKE cleaning car tires, carpet, upholstery, auto interior, leather, glass, and other gentle scrubbing.