Sybronendo K3 rotary files are a state-of-the-art asymmetric endodontic file system designed with a triple cutting edge to cut quickly, efficiently and safely, with unparalleled removal of dentine and debris. Positive tilt angle provides active cutting action. Large radial zone provides support for the blade while adding peripheral resistance to withstand torsional stresses. The third radial plane stabilises and keeps the instrument centred in the channel and minimises snagging. The released radial plane reduces friction on the channel wall and prevents over-instrumentation.