Product Description: Quantity: one set (4 pieces) Material: nylon scouring pad. Diameter: 4 in. Thickness: 16 mm. Hole diameter: 16 mm. Type: 120# (green, with sandpaper). 180# (green, without sandpaper). 240# (red, with sandpaper). 320# (red, without sandpaper). Set of 4 nylon fiber flap wheels: 2 x 120 grit green and 2 x red 240 grit nylon fiber flap discs for fast sanding and heavy duty removal, providing fast and durable cutting, and 2 x 180 grit green and 2 red 320 grit nylon fiber abrasive wheels, suitable for for polishing and finishing all kinds of surfaces. Will meet your demands from removal to fine polishing. Strong Compatibility: Our sanding discs are suitable for angle grinders, polishing tools. Widely used for cleaning, finishing and polishing on metal, stainless steel, glass, jewelry, plastic, ceramic, marble, wood. Fiber flap discs nylon with aluminum abrasive---can remove rust, paint and irregular curved surface coatings quickly and easily, without damaging the original surface; high tenacity fiber, special viscose, water and oil resistant, long service life. Nylon fiber polishing wheels - Strong wear resistance, with low noise of grinding and uniform grinding effect, less dust. Ideal for polishing and finishing all kinds of surface conditions. Size Details: All angle grinder abrasive discs are 4" in diameter and 16mm thick and hole diameter.