1.Tungsten Carbide Materialthe nail drill bits set are made of tungsten carbide metal work well in carving, cleaning, grinding, sanding, polishing etc. suitable for natural nails and almost all gel nails.2.3/32 inch Diameter of ShankFits most of the rechargeable or electric manicure nail drill machines. Professional Finger Toe Nail Care Electric Nail Drill Machine Manicure Pedicure Kit Electric Nail Art File Drill.3.20pcs Different Nail Drill Bits to ChoiceVarious shapes and sizes are good for cuticle removing, acrylic nails polishing, smoothing, shaping and cleaning.4.Easy to useNail Drill Bits set are suitable for nail salon, beauty parlor, spa or home manicure pedicure, Professional manicurist for beginner.5.Wide usagethe nail drill bits have the optimum strength, sharpness, durability. 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.