1. Unlike other sanding discs and paint removing wheels, these pads have great wear resistance and will not damage the aluminum while remove even tough paint in an old airstream. Besides, if you are looking for some wheels to polish stainless steel tube, then buffing pads will make the tube repaired from small scratches and damages and to shine . 2. sanding grinding wheels set are suitable for angle grinder, polishing tools. Widely used for cleaning, finishing & polishing on metal, stainless steel, glass, jewelry, plastic, , , wood crafts. 3. Nylon Fiber Flap Discs with Sandpaper --- Can removes rust, paint and coatings of irregular curved surface quickly and , without damaging the surface; High tenacity fiber, viscose, resistant to water and oil, long service life. 4. Size Details --- All of angle grinder sanding discs are 4 inch in diameter and 16mm/0.62inch thickness and hole diameter. 5. 8Pcs Nylon Fiber Flap Wheels Set --- Including 2Pcs 120 Grit green nylon fiber flap discs & 2pcs 240 Grit red ones for high speed sanding and heavy duty removal, delivering fast and long lasting cut, and 2Pcs 180 Grit green nylon fiber grinding polishing wheels & 2Pcs 320 Grit red ones, suitble for polishing and finishing all kinds of surface conditions. Will satisfying your requirements from removal to fine polishing. Colour:Red + Green Material:Scouring pad Size:100x16mm Diameter: 4 Inch Package Contents: 2 x 120# Nylon Fiber Flap Disc (Green, with sandpaper ) 2 x 180# Nylon Fiber Flap Disc (Green) 2 x 240# Nylon Fiber Flap Disc (Red, with sandpaper) 2 x 320# Nylon Fiber Flap Disc (Red) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.