♥ Small Barrel Nail Drills, Super Cut Edition: Upgrade design of the file-teeth, innovative sharper edge. | ♥ The Super Cut File-Teeth suitable for super-hard nail gels and acrylic nails. | ♥ Compare with normal file-teeth nail drills: Super cut ability; Low vibration, more stable filing; Smoother Surface; Better filing / cutting efficiency. | ♥ Dimension of File Head: Dia. 0.21 inch (5.35 mm) * 0.5 inch (12.7 mm). Shank: 3/32 inch (2.35 mm) | ♥ Made of Tungsten Steel