The DARK Sharp Flame Diamond Drill Bit (2.1 x 10 mm) is a precision tool for professional nail technicians. Its narrow 2.1 mm diameter and pointed tip allow for incredibly detailed work, making it ideal for deep cleaning of the nail sinuses and lateral folds. The red notch indicates a fine abrasive grit, which is perfect for processing normal, thin, or sensitive skin without causing trauma. It effectively lifts the cuticle "pocket" and removes pterygium. Crafted with high-quality, sieved diamond particles, it ensures a smooth, uniform surface that doesn't rust and can withstand all standard sterilization methods (dry heat and autoclave).