The medium stiffness Kitchen scrub brush kit includes our most popular brush: The Original Drillbrush Power Scrubber (green and black version). This versatile brush is great for getting into corners, contours, and around pipes and fixtures. One 4-inch diameter, round, flat brush for larger tile areas or flooring. For those tight spots: two 2-inch diameter round brushes are included in both long and short bristle lengths. All four brushes are medium stiffness for all purpose cleaning of kitchen surfaces. These brushes should cut your kitchen cleaning and scrubbing time in half (or more) compared to the rigorous effort involved in hand scrubbing. These spin brushes also do a better job of restoring, and then maintaining your kitchen surfaces. The brushes have 1/4" steel quick change shafts for rapid change-out between tasks. Drillbrush was established in 2007, we have been designing and innovating brushes based on feedback and demand from our valued customers. Our brushes are professional quality and have been tested and approved by commercial cleaners, marinas, detail shops, and others industry "hands on, daily user" reviewers to be the absolute best solution for a wide variety of cleaning and scrubbing tasks.