This product is a set of professional nail drill bit for nail art machine. It contains 12pcs nail drill bits, helping you polish and reshape your nails. Some nail drill bits of this product is cuspidal, easier to remove the dead skin near your nails. These nail drill bits are different in shape or size, which can meet your different needs. The grinding head is made of wool. It is softer than other products, protecting your nails during polishing. Storage box is provided, easier to store.