K-Flex #60 stainless steel file, 21 mm, box of 6 files. Maintains cross-sectional strength. More flexibility than traditional files. Reduced potential for ledging and perforating. Accommodates canal curves for preparation efficacy. The unique rhomboid design of K-Flex Files offers a short axis for flexibility, ensuring unchanging cross-sectional strength. Compared to traditional "K" files of the same #, particularly in #s #30 and above, the greater flexibility of K-Flex supports the meeting of curved canals and their preparation with lesser chances of ledging and perforating.