1Rough Surface: The surface roughness of the drill bit changes from top to bottom, and nail glue can be quickly removed in order to clean, shape, cut and remove to meet your various needs. 210pcs: You will get 10pcs nail drill bits that fit most drill bit nail machines, suitable for most gel nails and experienced manicurists or nail art beginners. 3Plastic Protective Box: Comes with a matching storage box for protection drill bits and easy storage, making these nail drill bits organized and easy to carry. 4Rotatable Grinding Head: The drill bit can be rotated to the right or left for a efficiently cut clockwise and counterclockwise, ideal for both left and right hands without changing other sizes during operation. 5Stable Sanding: This nail grinding drill is reliable, durable, has low cutting performance and is less dusty during the grinding process.