Original KMIZ Nail Drill Bit [5‑Pack] – Diamond Drop Shape, 4.0 mm, Medium Grit, 3/32" Shank – E‑File Bit for Callus Removal, Crack Treatment & Nail Smoothing

Diamond nail drill bit, model DFL 4.0-12M. Drop shape with rounded tip, 4.0 mm diameter, and medium grit. Designed for callus removal, crack treatment, nail plate smoothing, and lateral nail fold work during e-file manicures and pedicures. Medium abrasive handles thicker calluses and denser keratinized skin more efficiently than the fine-grit variant (DFL 4.0-12F), making it the first-choice drop bit for pedicure sessions with significant callus buildup. The 12.0 mm working part provides extended contact for continuous-stroke techniques on heels, plantar areas, and large nail surfaces. The rounded tip allows safe transitions between skin and nail plate zones. Use medium grit for initial reduction, then switch to fine grit for finishing. Manufactured by KMIZ (est. 1931) on Swiss precision equipment. ISO certified. CE marked. Shank diameter: 2.35 mm (3/32"). Working part length: 12.0 mm. ISO: 866.104.260.120.040.

• 5‑Pack KMIZ Nail Drill Bit DFL 4.0-12M — medium-grit diamond drop-shaped bits with a rounded tip and 4.0 mm head, designed for callus removal, crack treatment, nail plate smoothing, and lateral fold work during e-file manicures and pedicures. The medium abrasive removes material faster than the fine-grit version (DFL 4.0-12F), making it the primary working bit for thicker calluses and denser skin. Manufactured by KMIZ — a medical instrument factory established in 1931, producing on Swiss Rollomatic CNC equipment with ISO 9001 and ISO 13485 certification.
• Medium diamond grit cuts through callused and keratinized skin more aggressively than fine-grit equivalents, reducing the number of passes needed on tougher tissue. The rounded tip distributes pressure across a curved contact area, preventing point-loading that can damage skin or nail plate. The teardrop body allows dual-mode work — the tip for precision in narrow zones like nail folds, the midsection for faster coverage on broader areas like heels and plantar surfaces.
• In pedicures, used as the primary tool for reducing calluses on heels, ball-of-foot areas, and lateral folds. Smooths cracked skin along toe margins and foot edges. Treats hardened buildup around nail beds where fine grit would be too slow. In manicures, effective for smoothing ridged or deformed nail plates before overlay application. The 12.0 mm working part covers large treatment areas in continuous strokes. Pairs with the fine-grit drop (DFL 4.0-12F) for finishing after medium-grit initial passes.
• Standard 3/32" (2.35 mm) shank fits all professional electric nail file machines. Balanced construction provides stable rotation with minimal vibration at low to medium RPMs. Compatible with both right- and left-handed handpieces. The 12.0 mm working length allows long sweeping passes across skin and nail surfaces, reducing repositioning and lowering hand fatigue during extended pedicure sessions.
• ISO 866.104.260.120.040. Head diameter: 4.0 mm. Working part length: 12.0 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.