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 washers serrated locking bits Ø 76 mm grit 40/60/80/120 # standard blue, inner bore 10 mm, outer diameter 76 mm (3) suitable for 8 V and 12 V angle grinders. Edge and surface: Flap discs for grinding, surface and edge grinding. Polishing other materials, smooth without bumps, burrs, fade-free. Application:Flap discs, suitable for stainless steel, PVC, metal/steel and wood. For coarse derusting of metal, removing old layers of paint, smoothing coarse wood, etc. Matters needing attention:Install the device according to the specifications required to confirm the speed maximum. Please wear personal protective equipment if necessary.