Diamond drill bit D-60 shape Barrel; head size 6.0x13.0 mm Diamond Nail Drill Bits - Large Barrel Shape The Diamond Nail Drill Bits in a Barrel shape are expertly designed for precision and efficiency, making them the ideal choice for manicures and pedicures. As the largest barrel-shaped bit, this model is widely popular among nail technicians due to its versatility and superior performance. Fine (Red): Perfect for removing the gloss from natural nails and prepping them for acrylic application. Ideal for treating pterygium and gently lifting non-adjacent cuticles. Safely opens sinuses during the process. Medium (Blue): Excellent for correcting the free edge of the natural nail plate. Lifts and removes cuticles. Polishes periungual ridges for smoothness. Prepares the nail plate for coatings. Cleans the nail wall for a flawless finish. Coarse (Green): Ideal for removing parts of the nail plate. Creates an arch under the nail. Treats and removes corns and calluses. Effectively addresses surface cracks. Product Specifications: Max Speed: Up to 25,000 RPM Shank Diameter: 3/32” Length: 45mm Head Dimensions: 6.0 x 13mm Shape: Barrel Material: Diamond (Head), Stainless Steel (Shank)