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.