These tools turn your corded and cordless drill into a grinder for preconditioning, grinding, sharpening, and removing rust. Easily polish various knives, metals, handicrafts, jade, scissors, drill bits, chisels, and more to restore their sharpness and color. Brown Corundum Grinder (70mm): Suitable for high-strength metals such as carbon steel, alloy steel, forged iron, and hard bronze. Green Chloride Grinder (70mm): Ideal for grinding carbide, optical glass, ceramics, and other hard and brittle materials. Easy to Install: Mount the grinder on a conversion rod and connect it to an electric drill for convenient and efficient grinding. Use the fixed bracket to secure it to a tabletop for improved stability and reduced fatigue during extended use. Compatibility: Designed for use with lithium-ion and AC electric drills. Not compatible with electric mills, electric hammers, electric wrenches, or impact drills. Precision Bearing: Features a precision bearing with excellent concentricity for smooth, accurate grinding without vibration. The compact and portable design makes it ideal for various work environments, including workshops and garages. 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, ensure all screws are tightened and components are securely fastened. - Ensure proper fit between the pressure plate and electric drill to avoid operational issues. Type: 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 compared to the actual item. Measurement error allowed is +/- 1-3 cm. Only the items listed above are included.