Good for right hand and left hand nail artists. And also easy to operate when you need different rotate direction for nails. Teeth at the top of Drill: the teeth for dead skin, cuticle. You can remove nail polish / dip powder, and even the acrylic nails and decorations. Just choose a right size/ part of the drill to do it. Made of Tungsten steel, high hardness, long term life. Great cutting, each drills teeth is in good order. Perfect for use on acrylics or hard gels, excellent smoothing cutting performance for nail professional or home. Specification: Size: 4.5cm Matetial: tungsten steel Package Includes: 5 Pcs Nail Drill Bits Note: Conversion: 1inch=2.54cm, 1cm=0.393inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!