The NAILSOFTHEDAY Diamond Needle Bit is a precision tool crafted for professional hardware manicures and pedicures. Its extra-slim needle shape and 1.6 mm diameter allow for meticulous work in the tightest areas. The red ring signifies a fine grit, making it safe for delicate skin and natural nail plates. It is ideal for cleaning the pterygium from the nail surface, opening up the "pocket" under the cuticle, and removing keratinized skin from the lateral folds without causing trauma.