Note: Manual measurement, please allow 0-1cm/0-0.4 inch error. Specification: Item Type: Nail Polishing Head Material: Tungsten Steel Size: Approx. 40.4 x 13.5 x 6 mm/1.6 x 0.5 x 0.2 inches Shank Diameter: Approx. 2.35 mm/0.09 inches Uses: Household, Nail Salon, etc. Features: 1. Complete functions, interchangeable use, can be rotated back and forth, with shaping, nail polish removal, radian engraving and other functions, easy to use. 2. Hard tungsten steel nail drill is suitable for a variety of professional tasks, such as engraving, grinding, sharpening, nail removal, etc., is an ideal nail tool. 3. The universal 2.35mm tool holder diameter is suitable for most grinders on the market. The tool holder diameter of the grinding head is made of tungsten steel, which is durable. 4. The 2-way rotating nail drill is suitable for left and right hand operation, with excellent cutting performance, suitable for nail professionals or families. 5. It is used for polishing nails, manicures, and removing nails. It is sharp, easy to clean and disinfect, wear-resistant, and quick to remove nails.