1、The grinding head has complete functions and can be used interchangeably. It can be rotated forwards and backwards. 2、It has the functions of shaping, removing gel polish, removing dead skin, carving radian, etc., and is convenient to use, which can meet the needs of different nail art, a variety of applicable places. 3、With multi‑function drill, the tungsten steel nail drill bit is an ideal nail tool to complete a variety of professional tasks, such as engraving, grinding, sharpening, grinding, polishing and so on. 4、The general‑purpose 2.35mm shank diameter is suitable for most of the grinders on the market. The shank diameter of the grinding head is made of tungsten steel which is strong and durable. 5、Made of durable high quality tungsten steel materials, which are not easy to break and deform, and have good strength, durability, good cutting performance and good heat dissipation. Item Type: Nail Drill Bit Material: Tungsten Steel Quantity: 2pcs / setSmall Size: Approx. 3.75cm x 2.35mm / 1.5 x 0.1in Large Size: Approx. 4cm x 5mm / 1.6 x 0.2in Handle Diameter: Approx. 2.35mm / 0.1in Characteristics: Used for Shaping and removing gel polish, etc. It should be used with electric nail drill. Applicable: Home, nail salon, etc. 2 x Drill Bits 2 x Storage Boxs