Diamond Nail Drill Bit D-66, shape Rounded Cylinder; head size 1.8x8.0.mm The Diamond Nail Drill Bits in a Rounded Cylinder shape are designed for safety, precision, and versatility, enhancing the nail grooming experience for both professionals and enthusiasts. Fine (Red): Ideal for removing the gloss from natural nails and prepping them for acrylic application. Perfect 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. Prepares the nail plate for coating. Cleans the nail wall for a flawless finish. Coarse (Green): Efficient at removing part of the nail plate. Effective for treating and removing corns and calluses. Ideal for grinding hyperkeratosis on the feet and addressing surface cracks. Product Specifications: Max Speed: Up to 25,000 RPM Shank Diameter: 3/32” Length: 45mm Head Dimensions: 1.8 x 8mm Shape: Rounded Cylinder Material: Diamond (Head), Stainless Steel (Shank)