DPI K File is manufactured by twisting or grinding a square or triangular tapered shaft so that the cutting edges are almost perpendicular to the long access of the instrument. Designed with four cutting edges & a 60° tip with a 135° cutting angle with good cutting ability. This together with its tight spiral ensure a safe preparation. With a more refined cutting edge, a square cross-section, these files last up to 8-10 endodontic cases.