Descriptions: 1. Made of tungsten carbide, with super strength, sharpness, durability and heat resistance. The tungsten carbide material will not rust and prevent corrosion. Clean drill bits after every use. Scrub with a brush and rinse with soapy water. 2. The nail drill bit set comes with 10pcs drill bits with different sizes for professional jobs such as carving, grinding, sharpening, sanding, polishing, and a professional nail drill set to meet all needs of dead skin removal, shaping, or removing gel art nails. 3. Nail drill bit set nails are suitable for natural nails as well as artificial nails, Suitable for nail art beginners and professionals. 4. The 1/9" nail drill bits are universal for most electric or rechargeable nail drill machines. 5. This package Comes with a small transparent storage box, easy to store. 6. Notice: When using the nail drill, you must pay attention to the operation, so as not to damage the original nails. Specifications: Shank: 2.3mm / 1/9" Total Length: 45mm / 1.77", 42mm / 1.65", 50mm / 1.97" Grinding Head Size: 2x5, 2.5x2, 1.6x13, 2.5x10, 2.5x15, 5.5x5.5, 3x8.5, 4x11, 5.7x16, 7x5.5mm (D*L) Package Content: 10 x Nail Drill Bit