15 in 1 Multifunctional Design: Surface roughness of the drill bit changes from top to bottom, and a nail bit of one size can perform functions of multiple sizes. 2Practical: Drill bit can quickly remove, clean, shape and cut acrylic or hard gel to meet your various needs. 3Bilateral Rotation: 5 in 1 drill bit can be rotated to the right or left to achieve smooth cutting in clockwise and counterclockwise directions. It is very suitable for left and right hands. 4High Strength: Made of hard tungsten steel, reliable strength, high durability, low cutting performance, less dust, can quickly and well reshape, polish, engrave and smooth gel nails or acrylic nails . 55 Sizes of Nail Drill Bits: Including XF, F, M, C, XC, these sharpening heads are suitable for most nail machines with drill bits, and suitable for most gel nails and experienced manicurists or beginners in nail art. Item Type: Nail Drill Bits Material: Tungsten steel Product Model: XF, F, M, C, XC Product Handle Diameter: Approx. 2.35mm / 0.1in Characteristic: Used for manicure, nail removal, etc. to be used with nail polisher. Product Application: Household, nail salon, etc. 5 x Nail Drill Bit 1 x Dust Brush 6 x Storage Box