Features: High quality,the nail tools are made of safe and reliable tungsten steel materials, with perfect grinding effect and long service life. convenient grinding, high efficiency and stable performance. when used for a long for time, the bit will not be as hot as the metal bit. make nails smoother and easily create the perfect nail art. Suitable for most size 3/32" nail drill machine. suitable for nail salon, beauty parlor, spa or personal manicure pedicure, diy nail art at home.it is fun and happy to apply nails at home with family and friends. Wide range of uses,very suitable for manicure and pedicure, glass, plastic, metal, stone, ceramic tile, ceramics, etc, and can be used for natural nails and artificial nails. The perfect gift, this polished for head kit is the perfect gift for mother female friends,with it, your mother can easily make diy nails or manicures and pedicures. Easy to clean,the tungsten carbide material will not rust and prevent corrosion. clean and sterilize drill bits after every procedure. scrub with a brush and rinse with soapy water. Specifications: Material:Tungsten Steel Shank Size:2.35mm/0.09inches(3/32") Tape:21,30,31,34,35,39 Package Includes: 1 Piece Nail Drill Bit note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the pic may not reflect the actual color of the item.