These tools convert your corded or cordless drill into a grinder for surface preparation, grinding, sharpening, and rust removal. Easily polish various knives, metals, handicrafts, jade, scissors, drill bits, chisels, and more to restore sharpness and appearance. Brown Corundum Grinder (70mm): Ideal for high-strength metals such as carbon steel, alloy steel, forged iron, and hard bronze. Green Silicon Carbide Grinder (70mm): Suitable for carbide, optical glass, ceramics, and other hard, brittle materials. Easy to install: Attach the grinder to a conversion rod and connect it to an electric drill for convenient and efficient operation. Use with the included fixed bracket mounted on a tabletop for improved stability and reduced user fatigue during extended grinding tasks. Compatible with lithium-ion and AC electric drills. Not suitable for electric mills, electric hammers, electric wrenches, or impact drills. Precision bearings ensure high concentricity for smooth, accurate grinding without vibration. Compact and portable design makes it ideal for use at home, in workshops, garages, and other work environments. Warm Tips: - Adjust the pressure plate, insert into the electric drill, align the drill with the bearing, then secure with screws and nuts. - After installation, verify all screws are tightened and components are securely attached. - Ensure proper fit between the pressure plate and electric drill to avoid operational issues. Type: B/A Color: As shown Material: Metal Package Contents: 1 x Holder 1 x Grinding wheel Note: Light reflection and display differences may cause slight color variations. This does not affect product performance.