Triple Flex Files Flex File Size 8 25 mm Stainless Steel Color Coded Grey With Twisted Flutes, 6/Box. Stainless Steel build. For thorough removal of debris. Guarantees flexibility and stability. Extremely damage-resistant despite intense pressure. Triple Flex Files are stainless steel instruments with a triangular blade design that promotes high break resistance. Flutes are twisted, not ground, to deliver dynamic cutting and efficient debris removal without compromising stability.Available in various ISO color-coded #s from # 06 to # 45 and in 21.0 mm, 25 mm, and 30 mm lengths.