Jet Tools' 12 in. Half-Round Smooth Cut File is built from hardened steel to ensure durability and consistent performance under repeated professional use. The fine tooth geometry reduces material removal rate in favor of precision, allowing controlled finishing without gouging or over-cutting. Suitable for steel, iron, and other ferrous metals, this engineer-style file is commonly used for refining machined parts, smoothing contours, and achieving accurate surface tolerances in workshop and industrial settings.