Replaces blue floor pads (formerly Scrub-Grit® III). For aggressive top scrubbing of ceramic tile, rubber, terrazzo, and VCT. Irregular bristle length to assure cleaning on uneven surfaces. 1.5" nylon fibers impregnated with 180 grit silicon carbide. Available in 11" - 19" diameter showerfeed blocks with 1 3/4" trim.