Rotary Brush, Application Scrubbing, Fits Machine Size 30 in, Shape Round, Material Polypropylene, Bristle Material Polypropylene, Bristle Color Black, Brush Diameter 15 in, Trim Length 1 3/4 in, Block Size 13 3/4 in, Bristle Diameter 0.02 in, Compatible with Grainger Part Number 56NU90, Overall Diameter Not Applicable, Series Not Applicable, Standards Not Applicable, Wear Marker No