For light to medium scrubbing of brick and stone, ceramic tile, sealed or unsealed concrete, marble, non-slip rubber floors, quarry tile, rubberized sports floors, slate terrazzo, vinyl and wood floors. Gray-colored .018" Glasspro® nylon fibers impregnated with 500 grit silicon carbide. 1" trim. Equipped with 5/8" riser. Replaces red pads. Block is heavy duty plastic for long wear without chipping, cracking or busting. Metal clutch plate is included. Please choose your machine make and model from the drop-down list. BRISTLE COLOR MAY VARY FROM PICTURE SHOWN. THIS DOES NOT EFFECT QUALITY. 11" Light Duty Rotary Scrub Brush (500 grit) $131.23 12" Light Duty Rotary Scrub Brush (500 grit) $158.10 13" Light Duty Rotary Scrub Brush (500 grit) $179.83 14" Light Duty Rotary Scrub Brush (500 grit) $210.00 15" Light Duty Rotary Scrub Brush (500 grit) $242.34 16" Light Duty Rotary Scrub Brush (500 grit) $263.85 17" Light Duty Rotary Scrub Brush (500 grit) $294.43 18" Light Duty Rotary Scrub Brushes (500 grit) $320.15 19" Light Duty Rotary Scrub Brush (500 grit) $341.23 20" Light Duty Rotary Scrub Brush (500 grit) $378.52