This four piece power scrub brush kit is designed for use with most cordless drills (drill not included). These drill brushes should cut your cleaning and scrubbing time in half or more compared to the rigorous effort involved in hand scrubbing. These power brushes also do a better job in maintaining your bathroom surfaces. This power scrubber drill brush kit is in the yellow medium stiffness. These nylon bristles will not scratch and can be used on tubs, sinks, baseboards, fiberglass shower enclosures, shower door tracks, and porcelain to save yourself time and effort cleaning all kinds of different surfaces.We have other power brush drill attachments in other stiffness's and colors that may better suit you cleaning needs, so please look at our drill brush power scrubber color chart in the listing images. Each power scrub brush in this kit has a different size and shape to make sure you always have the best drill brush for the job. If you have any issues with your product please do not hesitate to contact us. This Drillbrush scrubber brush set is the power brush drill attachment that attaches to your cordless drill.