Product Material: Ceramic Package content: 1 piece of grinding head set (7pcs) 1.Premium Ceramic Material:Made of superior ceramic material, these nail art tools are hard-wearing, sharp and durable and also crafted with delicate. With an excellent heat dissipation, the bits won't be burning hot during long-time use like metal ones 2.Perfect Drill bits:Totally 7PCS different nail drill bits, which fit most nail drill machines that use bits, durable for long time use.They could be used for polising nail surface or even getting into tight areas such as sidewalls and cuticles part.The drill bit brush bit helps clean and shine nail surface and drill bits 3.Multi Functions:Adopt the highest precision standards ceramic with superior strength, sharpness, and durability.Professional shapes and sizes design meets the diversified needs, like nail beautify, nail clear, and care. Ideal for refining and shaping nail edges and removing dead skin easily 4.7Pcs Nail Drill Bits:Set of a Corn Top(coarse grit),Large Barrel Top(medium grit),Ball Barrel Top(fine grit),Umbrella Top(fine grit),Needle Bit(Medium grit),Micro Ball bit(medium grit),Brush Drill Bit.Suitable for most size shank nail drill machine 5.Easy to Clean: Nail drill bits are corrosion resistant, as well as no clogging for nails. Nail Brush Bit can easily clean the dust on the bits or nails, protect the bits after each use, keep you and your clients nails healthy