They are perfect for removing nails and grinding dead skin, can be applied for natural nails as well as artificial nails. Made of materials, not easy to rust and durable for long time use, suitable nail drill bits replacement for home daily or salon nail polishing use. Features - Color: As shown. - Material: Alloy tungsten steel. - Size: 1.50X1.50X4.50cm/0.59X0.59X1.77in. - Made of premium and sturdy material, the nail drill bit set has high durability, not easy to deform. - It can help you do diversified jobs, such as carving, grinding, sharpening, sanding, polishing and so on. - Suitable for natural nails and all gel nails, bring more conveniences for nail polishing. - A nice tool set for manicurist or beginner, nail salon, spa or personal manicure pedicure, etc. - They are perfect replacement for nail drill bits, also will keep you and your client’s nails healthy. Package list: 4 × nail drill bits