Manual files type K (Kerr) best for finding canals and working the thin root canals. With a tightly twisted steel spiral, four cutting edges (low ability of cutting), flexible - provide safety. Low ability to transport outside the cut dentin. The apex angle is 60 degrees.

Made of stainless steel and plastic, ensuring high quality and can be designed for manual work.

Files can be re-sterilized by dry air at a temperature of 180 degrees C in a steam autoclave at 135 degrees C or in the quartz balls sterilizers.