Features: Wide Usage: It can be used for grinding and polishing the surface of steel, aluminum, copper, plastic, wood, stone, concrete and so on. Application: For quick and effective removal of automotive paint, wood paint, rust, oxidation, descaling. And can be used for wood polishing and deburring. Shank: These nylon cup brushes with 1/4 shank fit most drill. You can install them easily. High Quality: These brushes are all high performance that made of high quality material with strong and high toughness, durable with high abrasive resistance, and they don\'t shed. Package: 1/4-inch round shank, 3-inch nylon cup brush, you can choose the color: blue, red or grey.