[4 Different Sizes & Medium Stiffness] Made of ultra durable and high quality PP (polypropylene), each bristle is stiff enough. Professional cleaning brush for tile, grout, floors, cars, carpets, bathrooms, showers, exc. Brush shapes for cleaning, these nylon bristles do not scratch, durable nylon bristles, drill not included [360 Drill Brushes * SAVE TIME] CLEAN FASTER - CLEAN BRUSHES THAT ATTACH TO EVERY CORDLESS DRILL - Turn your ordinary drill or impact driver into a powerful cleaning tool in seconds. Finish tough cleaning jobs faster and with a more thorough clean. Clean dirt, scum, stains, water spots and years of nasty buildup in record time[FITS 99% All Drills] A simple 1/4 inch steel shank quick connector slides right into your drill, then simply tighten.[Note] For best results, always wash the surface with water, then a detergent or soap such as a clean cloth or ultra-fast spray or apply stain extractor.[Customer Service] If you are not completely satisfied with our product, we will refund you in full or send a replacement at the buyer's request.For best results, always wash the surface with water, then a detergent or soap such as a clean cloth or ultra-fast spray or use stain extractor.Highlight2 in + 3.5 in + 4 in + 5 in high quality medium hardness bristlesThis drill brush is made of plastic High quality. The bristles are durable, enough to remove old stains and resist better than the soft carpet brush. Intensive cleaning