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K3 Nickel-Titanium Files from SybronEndo are commonly used for root canal preparations. Their unique, cross-sectional design makes them more resistant to cyclic fatigue, and they are able to negotiate the most challenging S-shaped curves with little to no canal deformation. They feature a positive rake angle that provides the safe and efficient cutting action. The file's wide radial land relief reduces friction on the canal wall and provides blade support while adding peripheral strength to resist torsional and rotary stresses. The third radial land stabilizes and keeps the instrument centered in the canal and minimizes over-engagement. Its handle allows the operator to easily access the posterior region of the mouth. The simple system only has two tapers, 04 and 06, and 10 sizes.