This pack of 10 Flame Nail Drill Bits, made from STAINLESS STEEL materials, includes a COMBO of different sizes (2.35mm) and shapes (tornado). Each bit has a diamond grit ranging from F (#240) to M (#120-#150). Made in Mainland China, these bits are designed for professional use with a head size of 2.0*10mm and come in a pack of 10 pieces.