Features: Wide processing ranges, used for all kind of metals, jades and glass. It have higher wear resistance and sharpness. Elastic grinding donot damage the workpiece, effectively prevent excessive cutting and scratching the surfaces of the workpiece. It can be polished and polished, used for fine grinding and polishing/making the surfaces of the workpiece smooth and smooth. Perfect for use in jewelry crafting, home repair projects, and industrial manufacturing, providing smooth, mirror like surfaces and enhancing product value. With its robusts construction and user friendly design, this set is a essential addition to any toolkit, offering reliable performances for both professional and hobbyist applications. Specifications: Component:Composite Abrasive Size:As Picture Shown Grinding head use help The rotating speed should be higher than the generals requirements as much as possible, and the linears speed should not be lower than 10-20m per second; Use with light pressure, and excessive force will make the grinding powder difficult to be discharged and the tool easy to be damaged; Try whether the tool jump. If it jump, you can't work directly. Adjust it to not jump and you can't use it. Go in and try to avoid shaking because shaking will cause local damage to the tool. Package Includes: 14pcs/set Abrasive Grinding Heads note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.