1. Various sizes and medium stiffness Made with ultra durable, high quality PP (Polypropylene), each bristle is stiff enough. Professional cleaning brush for tiles, grout, floors, cars, carpets, bathrooms, showers, exc. Shapes of brushes for cleaning, These nylon bristles will not scratch, Durable nylon bristles, Not include drill bits2. Drill Brushes 360 Save Time Clean Faster - Clean Brushes That Attach to Every Cordless Drill - Turn your ordinary drill or impact wrench into a powerful cleaning tool in seconds. Finish stubborn cleaning jobs faster and with a more thorough clean. Clean grim, scum, stains, water stains and years of nasty build-up in record time.3. FITS drill bit Simple steel shaft quick connector slides straight into your drill bit then simply tighten.4. The Note For the best results, always wash the surface with water and then use detergent or soap such as cloth clean or lightning-fast stain extractor spray or apply.