Notpolish's Safty 4xC L-smooth Top is a red coated carbide bit the perfect size helps get in those small areas and large. This bit will smooth and shape all nails plus in backfill cutting. Removes gel, dip and acrylic. The smooth top will help when shaping the nail in a C -curve. Recommended to not let the Bit soak in acetone or barbicide longer than 10 minutes. Any time longer than suggested will result the Bit to discolor the red coat.