General description Flap discs are made of high-quality aluminum oxide resin fiber and fiberglass backing plate, providing high density and abrasion resistance. This 10-pack includes 40 grit sanding discs with a 4.5 inch outer diameter and a 0.87 inch mandrel. These discs are designed for grinding, deburring, cleaning, chamfering, sanding, and finishing various surfaces, making them suitable for removing rust and paint, as well as providing excellent performance on welds. Technical specifications Quantity: 10 pcs Grit: 40 Outer diameter: 4.5 inch Mandrel diameter: 0.87 inch Maximum speed: 18,000 rpm Compatibility and accessories Compatible with most air and electric grinders and angle grinders Usage Suitable for both professional workers and beginners Provides the greatest surface contact for smooth or curved surfaces Easy to use without requiring specialist skills Other information Wear eye protection and gloves before starting work Watch for sparks to prevent fire hazards Do not