PlanB NiTi Hand Files have precision ground flutes in K-Style four-bladed geometry. Featuring a proprietary heat treatment; PlanB NTK files are designed to offer the clinician unique toughness, the ability to prebend the tips when encountering empediments, while experiencing a clear tactile response with reliable and consistent performance. The PlanB NTK files are available in .02 Taper with ISO tip sizes from .08 to .60.