Ceramic Nail Drill Bits are made of the strongest and the toughest Zirconia ceramic material,have an eye-catching appearance for easy identification. It performs better on usability than carbide nail drill bit and does not hurt your nail beds. It’s grits: 3XF, 2XF, XF, F, M, C, XC, 2XC, 3XC, 4XC. Shank Size: 3/32″(2.35mm).