Sufficient quantity: you will receive totally 20 pieces replacement nail drill heads, which are helpful tools for polishing nails, enough quantity for you to apply in daily life and meet your replacement needs Sturdy material: our nail drill bits replacements are made of diamond, which are sturdy and solid with good hardness and nice sharpness, also heat dissipation and corrosion resistant, reliable for using for a long time How to apply: you just need to put the sanding bands on the nail drill heads, then put the nail drill heads on the electric nail grinding machine for removing nails and grinding dead skin, can be applied for natural nails as well as artificial nails Wide range of applications: these nail drill heads are widely applied in nail salons, beauty parlor, spa and personal nail care or DIY nail art at home, practical to grind, smooth and polish your nails, nice for both manicurist or beginners, give you a nice using experience Useful gifts: the replacement nail drill heads are helpful for women and girls who love to do nail art, nail care at home, so you can prepare them as a thoughtful gift for your wife, girlfriend, sister, or other female friends, they will feel happy when receiving it Features: Quickly and effectively smoothen nails and remove dead skin. Work for shaping both natural and artificial nails. Clean, sharpen, grind, carve, smoothen, polish and reshape gel nails, and stimulate nail growth. Grinding and carving different beauty nails. Specifications: Color: gold, silver Package includes: 20 x Nail drill heads(without sand ring) Note: Manual measurement, please allow slight errors on size.