K3 Rotary File 25 mm Size 50 Yellow 0.04 Nickel Titanium 6/Package Used for root canal preparation. Features a unique, cross-sectional design. Can negotiate even the hardest S-shape curves. Resists torsional and rotary stresses. K3 NiTi rotary file features a unique, cross-sectional design that allows K3 files to become highly resistant to cyclic fatigue. The K3 file negotiates even the hardest to reach S-shaped curves with minimal or no canal deformation.These third-generation files feature a three-fluted, asymmetrical endo file system that works to cut quickly, efficiently, and safely to guarantee a higher rate of debris removal.