Original KMIZ Nail Drill Bit [5‑Pack] - Diamond Ball, 3.1 mm, Fine Grit, 3/32" Shank - E‑File Bit for Free Edge Shaping, Callus Treatment & Crack Refinement - model DSP 3.1-F

Diamond nail drill bit, model DSP 3.1-F (Item #: 117939). Ball shape with 3.1 mm diameter and fine grit - the most compact ball bit in the KMIZ professional range. Designed for precision free edge shaping, minor callus treatment, and crack smoothing during e-file manicures and pedicures. The 3.1 mm head targets specific areas without affecting surrounding tissue, making it essential for narrow nail plates, smaller toes, and confined lateral zones. Completes a three-size ball-bit set with the 3.5 mm (DFL 3.5-F) for medium zones and 5.0 mm (DFL 5.0-F) for broad surfaces. Manufactured by KMIZ (est. 1931) on Swiss precision equipment. ISO certified. CE marked. Shank diameter: 2.35 mm (3/32"). Working part length: 2.7 mm. ISO: 856.104.001.027.031.

• 5‑Pack KMIZ Nail Drill Bit DSP 3.1-F - fine-grit diamond ball bits with a 3.1 mm spherical head, designed for shaping the free edge of the nail, treating calluses and rough skin, and smoothing cracks during e-file manicures and pedicures. The smallest ball in the KMIZ professional lineup - built for maximum precision in tight zones where the 3.5 mm and 5.0 mm balls are too wide. Manufactured by KMIZ - a medical instrument factory established in 1931, producing on Swiss Rollomatic CNC equipment with ISO 9001 and ISO 13485 certification.
• The compact 3.1 mm sphere creates a small, controlled contact footprint that allows the technician to target specific spots without affecting surrounding tissue. Fine diamond abrasive provides gentle material removal with minimal heat buildup. The spherical geometry distributes pressure evenly across the curved surface, preventing point-loading even at this small diameter. The ultra-short 2.7 mm working part keeps the entire abrasive surface visible during use, giving full control over exactly where the bit contacts skin or nail.
• In manicures, used for precision shaping of the free edge on natural or artificial nails — corrects corners, smooths the underside, and refines asymmetry on narrow nail plates where larger balls would overlap onto sidewalls. In pedicures, treats minor calluses and rough skin in confined areas around smaller toes (particularly the 4th and 5th), smooths cracks along nail margins, and refines tight lateral folds. Pairs with the 3.5 mm ball (DFL 3.5-F) for medium zones and the 5.0 mm ball (DFL 5.0-F) for broad surfaces in a complete ball-bit set.
• Standard 3/32" (2.35 mm) shank fits all professional electric nail file machines. Lightweight, balanced construction delivers smooth rotation with minimal vibration at low to medium RPMs. Compatible with both right- and left-handed handpieces. The small head size provides unobstructed sightlines during detail work, allowing the technician to see the treatment area clearly without repositioning.
• ISO 856.104.001.027.031. Item #: 117939. Head diameter: 3.1 mm. Working part length: 2.7 mm. Shank: 2.35 mm (3/32"). Diamond coating retains grit consistency through repeated autoclave sterilization cycles. Suitable for both dry and wet techniques. Designed for trained nail technicians and podiatrists. The bit should be selected individually for each client and fully sterilized between uses.