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.