4pcs Bohrbrsten Stiffness: These brushes have 1/4 inch quick waves which can be attached to your cordless screwdriver. Different sizes and shapes of brushes: 2 + 3.5 inch inch + 4 + 5 inch stiff brush / fiber diameter: 0.4mm / li These nylon bristles do not scratch and can be used on tubs, sinks, baseboards, fiberglass showers, shower door tracks, pool tiles and porcelain / li cordless drill not included. Product The drill brush attachment fits all cordless drills and impact wrenches. The high quality, durable nylon bristles are perfect for scouring and cleaning fiberglass, porcelain, linoleum, tile and grout. The brush features a quick-change shaft that fits into your cordless drill. Its the perfect bathroom cleaning kit. Package included: 1 * 2 inch drill brushes 1 * 3.5 inch drill brushes 1 * 4 inch drill brushes 1 * 5 inch drill brushes