High Quality: Made of high-quality high-temperature calcined sand, high-quality cloth base, multi-layer sand discs, improve grinding performance and service life. Size: 8pcs Ø 76mm serrated lock washers, 40/60/80/120# grit, standard blue, 10mm inner bore, 76mm (3") outer diameter, suitable for 8V and 12V angle grinders. Edge and Surface: Flap discs for grinding, surface and edge grinding. Polishing other materials, smooth without bumps, burrs, or discoloration. Application：Flap discs, suitable for stainless steel, PVC, metal/steel, and wood. For rough rust removal from metal, removing old paint layers, rough smoothing of wood, etc. Matters requiring special attention：Install the device according to the required specifications to confirm the maximum speed. Please wear personal protective equipment if necessary.