Two brush set includes two 5 inch heavy duty Red scrub brushes Red Brush: This 5 inch diameter brush is produced to professional standards Bristle length is one inch and the bristles have are stiff Steel shaft has been engineered to resist spinning out of the block Save time and effort cleaning and scrubbing brick, concrete, and stone 5 Five inch diameter drill powered scrubbing brush features nylon bristles, rugged construction, and a dual purpose stainless steel shaft. This brush fits securely in battery powered drills. Red stiff bristles are designed for heavy duty scrubbing and tough stains on garage floors, brick and concrete. These brushes are also sold separately. Look for our other Drillstuff brand brushes.