This Rubbermaid Low Profile Scrub-Strip Carpet Bonnet makes floor cleaning easy. This 21 in carpet bonnet is intended for use with 175-300 RPM floor machines and features scrubber strips to smoothly remove stubborn blemishes with minimal effort. Use the bonnet with shampoo or solvent based chemicals for best effect. With a standard 19 inch diameter, the carpet cleaner is perfect for saving you time and getting touch stains out quickly. This lean, mean cleaning machine also comes with 5 green scrubber strips that are designed to tackle even the most stubborn blemishes.