The exceptionally durable, stainless carbide cutters prove particularly effective. They allow for pleasant, low-vibration work due to their precise manufacturing, lasting sharpness of the precise, computer-guided grind, and high concentricity. For working on nails and callus. Recommendation: To achieve best work results, operate carbide cutters at a minimum of 16,000 to 18,000 rpm. Smaller cutters, such as HM 296 GX 040 medium, run at a minimum of 25,000 RPM; if possible, use a higher speed of 40,000 rpm.