General description The Flap Discs come in a pack of 10, featuring a 4.5-inch diameter and 40# grit. Made from high-quality aluminum oxide resin fiber and fiberglass backing, these discs are designed for sanding metal and wood, providing excellent wear resistance and durability. Technical specifications Quantity: 10 discs Grit: 40# Outer diameter: 4.5 inches Mandrel diameter: 0.87 inches Maximum RPM: 18000 Compatibility and accessories Compatible with most air and electric grinders Suitable for angle grinders Usage Ideal for grinding, deburring, cleaning, chamfering, sanding, and finishing various surfaces Effective for removing rust and paint Excellent for welding performance Other information Safety tip: Wear safety glasses and gloves before starting work Be cautious of sparks and avoid directing them at flammable objects or people No need to apply excessive pressure; the discs will perform effectively with minimal effort