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: 8 Serrated Lock Washers 76mm Grit 40/60/80/120# Blue Standard, Inner Bore 10mm, Outer Diameter 76mm(3") Suitable for 8V and 12V Angle Grinders.Edge and surface: Flap discs for grinding, surface and edge grinding.Polishing other materials, smooth without bumps, without burrs, without fading.ApplicationFlap discs, suitable for stainless steel, PVC, metal/steel and wood.For coarse rust removal of metal, removal of old paint layers, smoothing of coarse wood, etc.Matters requiring attentionInstall the device according to the required specifications to confirm the maximum speed.Please wear personal protective equipment if necessary.