Provides clinicians with the safety and self-centered features of the original K3 NiTi Rotary files, but also offers a new level of flexibility and resistance to cyclic fatigue. Heat treated with R-phase heat treatment process to ensure half the stiffness and 2 times more resistant to fracture. Third radial land for better centering, more stability, and less chance of transportation. Variable pitch provides more control as it channels debris coronally. Axxess stainless steel handle ensures better posterior access.