✅ MEET ALL YOU NEED - This premium flap disc set includes 10 pieces of 40 grit, 5 pieces of 60 grit, 3 pieces of 80 grit and 2 pieces of 120 grit, which can be used for universal applications, ranging from metal or woodworking, concrete grinding or finishing, stone smoothing or finishing, to rust removal and more - perfectly offers all you need for your projects ✅ EXTREME DURABILITY AND VALUE - Made of hard zirconia alumina material which lasts longer than standard aluminum oxide abrasive material, built for a more robust and economical grinding wheel ✅ T29 FLAP DISCS WITH FIBERGLASS BACKING PLATE - T29 flap disc features angled flaps, which can be used for edge-working or contoured applications. These discs are also designed with a greater surface area than flat type for stock removal on horizontal surfaces. Fiberglass creates a strong bond with adhesives and does not contaminate the working surface. Fiberglass backing plate can effectively absorb vibration and bring more stable & efficient grinding