Industrial &ndash; DA - Scrub Brush - 7-in Black Ultra Stiff Bristles - Variable Speed Polisher - 5/8 x 11 Threaded Hub - Floor Cleaner - Furnace - Grill - Grate - Stone - Grill Brush - Rust Remover - Brick Professional Grade 7-inch diameter Ultra Stiff Black rotary scrub brush Clean Grates, Stone, Grills, Furnaces, and other industrial applications 5/8 x 11 Threaded Hub (not for use with grinders) For use with variable speed and dual action polishers Part number: 7in-L-K-T-DB