1Efficient: The surface roughness of the drill bit changes from top to bottom, one size nail drill bit can complete functions of multiple sizes, can quickly remove nail glue, meet your various needs. 2Flexible: The drill bit can be rotated to the right or left to achieve cutting clockwise and counter clockwise, no need to change other dimensions during the work, very flexible. 3Hard: Made of hard tungsten steel, reliable strength, high durability, stable performance, less dust, can be quickly and well reshaped, polished, engraved. 45 Grinding Heads: Nail grinding head contains 5 different styles of nail art drills that fit most drills for nail machines and gel nails. 5Plastic Protective Case: Nail drill bits come with a matching case for protection and convenient storage, making these nail drill bits easy to store.