PFERD m-brad bridle high density composite abrasive filament disc brush is designed for aggressive deburring in CNC and robotic machines. Bridle reduces filament flare during use. The bridle increases brush aggressiveness for applications where larger burrs need attention. For deburring, Honing, edge radiating, light cleaning, and polishing. Ergonomically optimized products and power tools that contribute to greater safety and working comfort, and thus to health protection. High-performance product solutions and power tools with outstanding added value. Specification: diameter (inches): 4; arbor hole (inches): 7/8; filament diameter: .022; filament material: nylon/silicon Carbide; Grit: 320; trim Length (inches): 1-1/2; recommended RPM: 1200 - 3000; maximum rotational speed (RPM): 3500.