Mercury 13" Stiff Poly Scrub Brush w/ "B / 92" Clutch Plate 1504The Mercury 13" Stiff Poly Scrub Brush w "B 92" Clutch Plate (1504) is a high quality replacement brush designed to restore the scrubbing power of your floor cleaning machine. Built with durable . 028 inch stiff Polypropylene bristles, this brush is perfect for tackling tough dirt and grime on a variety of floor surfaces. Whether your current brush is worn out or ineffective, the Mercury 1504 ensures deep cleaning performance and extended durability.