· Strong & Durabale: The hardness is similar to white corundum. The grinding stone for drill can be cleaned and restored after long-term use. They are stronger, sharper and more durable.· Unique Design: Made into a sharp bullet shape or cylindrical shape, the grinding wheels for drill fit into tight spaces for other grinding and shaping needs.Such as curved, flat and slotted surfaces. Ideal for sanding after beveling holes in metal and wood.· Excellent Sanding Effect: The abrasive mounted stone flap wheel can play an excellent polishing effect especially for stainless steel and other metals with low noise and less dust. Will not rust and fall out like the steel brush.· Various Model: 90 pack sanding wheel set contains 3 sizes : 10mm Cylinder Shape, 10mm / 12mm Bullet Shape（30 Pcs flap wheel each size）· Wide Adaptability: The 1/8" Shank makes the abrasive wheels be applied to electric drills, cordless drills, die grinders.Widely used for grinding, polishing, deburring of metal, wood, plastic and dog nail.· Warm Tip: For your safty, please make sure you wear SAFETY equipment such as a face shield (or Full Coverage Goggles) and gloves.