Package：20 Pieces cylinder shape wool felt polishing bits，Head size：5mm*11mm,shank diameter: 3mm.It can be used with most rotating tools, grinders, and drills. Material: Made of high-quality wool felt and metal, with high hardness and toughness, durable and long-lasting. Felt is not easy to peel off and will not damage or scratch the surface of the product during polishing. Usage: Used for polishing various surfaces. It can be used for trimming, carving, and polishing Application: Suitable for fine polishing operations on jewelry, gemstones, glass, watches, crystals, cars, motorcycles, bicycles, etc.